Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2019	Aug. 05, 2019
Document And Entity Information [Abstract]
Entity registrant name	TheRealReal, Inc.
Trading symbol	REAL
Entity central index key	0001573221
Current fiscal year end date	--12-31
Entity filer category	Non-accelerated Filer
Document type	10-Q
Document period end date	Jun. 30, 2019
Document fiscal year focus	2019
Document fiscal period focus	Q2
Amendment flag	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Small Business	false
Entity common stock, shares outstanding		85,316,361
Entity Current Reporting Status	No
Entity Shell Company	false
Entity File Number	001-38953
Entity Tax Identification Number	451234222
Entity Address, Address Line One	55 Francisco Street
Entity Address, Address Line Two	Suite 600
Entity Address, City or Town	San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94133
City Area Code	855
Local Phone Number	435-5893

Condensed Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 53,314	$ 34,393
Short-term investments	13,372	27,131
Accounts receivable	9,517	7,571
Inventory, net	12,664	10,355
Prepaid expenses and other current assets	10,563	9,696
Total current assets	99,430	89,146
Property and equipment, net	40,427	33,286
Restricted cash	11,700	11,234
Other assets	6,573	1,751
Total assets	158,130	135,417
Current liabilities
Accounts payable	4,469	5,149
Accrued consignor payable	33,404	35,259
Other accrued and current liabilities	42,475	41,956
Long-term debt, current portion	6,498	5,990
Total current liabilities	86,846	88,354
Long-term debt, net of current portion		3,249
Other noncurrent liabilities	10,076	7,304
Total liabilities	96,922	98,907
Commitments and contingencies (Note 10)
Temporary equity	367,330	294,200
Stockholders’ deficit:
Common stock, $0.00001 par value; 155,649,887 and 145,467,774 shares authorized as of June 30, 2019 and December 31, 2018, respectively; 9,701,266 and 8,593,077 shares issued and outstanding as of June 30, 2019 and December 31, 2018, respectively	1
Additional paid-in capital	1,729
Accumulated comprehensive income (loss)	5	(25)
Accumulated deficit	(307,857)	(257,665)
Total stockholders’ deficit	(306,122)	(257,690)
Total liabilities, redeemable convertible preferred stock, convertible preferred stock and stockholders’ deficit	158,130	135,417
Redeemable Convertible Preferred Stock
Current liabilities
Temporary equity	198,228	151,381
Convertible Preferred Stock
Current liabilities
Temporary equity	$ 169,102	$ 142,819

Condensed Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Jun. 30, 2019	Dec. 31, 2018
Temporary equity, shares authorized	115,185,867	105,003,754
Temporary equity, shares issued	114,960,357	104,778,246
Temporary equity, shares outstanding	114,960,357	104,778,246
Common stock, par value	$ 0.00001	$ 0.00001
Common stock, shares authorized	155,649,887	145,467,774
Common stock, shares issued	9,701,266	8,593,077
Common stock, shares, outstanding	9,701,266	8,593,077
Redeemable Convertible Preferred Stock
Temporary equity, par value	$ 0.00001	$ 0.00001
Temporary equity, shares authorized	37,403,946	31,053,601
Temporary equity, shares issued	37,403,946	31,053,601
Temporary equity, shares outstanding	37,403,946	31,053,601
Convertible Preferred Stock
Temporary equity, par value	$ 0.00001	$ 0.00001
Temporary equity, shares authorized	77,781,921	73,950,153
Temporary equity, shares issued	77,556,411	73,724,645
Temporary equity, shares outstanding	77,556,411	73,724,645

Condensed Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue:
Total revenue	$ 70,976	$ 46,985	$ 140,231	$ 93,444
Cost of revenue:
Total cost of revenue	24,926	16,206	51,799	32,060
Gross profit	46,050	30,779	88,432	61,384
Operating expenses:
Marketing	11,715	9,276	23,448	18,910
Operations and technology	34,320	22,997	65,865	44,329
Selling, general and administrative	25,355	14,377	47,674	27,901
Total operating expenses	71,390	46,650	136,987	91,140
Loss from operations	(25,340)	(15,871)	(48,555)	(29,756)
Interest income	610	81	1,015	165
Interest expense	(380)	(526)	(511)	(723)
Other expense, net	(1,706)	(1,279)	(1,987)	(1,387)
Loss before provision for income taxes	(26,816)	(17,595)	(50,038)	(31,701)
Provision for income taxes	59		59
Net loss	(26,875)	(17,595)	(50,097)	(31,701)
Accretion of redeemable convertible preferred stock to redemption value		(1,342)	(3,355)	(2,451)
Net loss attributable to common stockholders	$ (26,875)	$ (18,937)	$ (53,452)	$ (34,152)
Net loss per share attributable to common stockholders, basic and diluted	$ (2.83)	$ (2.28)	$ (5.87)	$ (4.11)
Shares used to compute net loss per share attributable to common stockholders, basic and diluted	9,494,447	8,314,251	9,102,234	8,307,010
Consignment and Service Revenue
Revenue:
Total revenue	$ 60,713	$ 42,178	$ 116,950	$ 83,177
Cost of revenue:
Total cost of revenue	17,200	12,349	33,147	23,926
Direct Revenue
Revenue:
Total revenue	10,263	4,807	23,281	10,267
Cost of revenue:
Total cost of revenue	$ 7,726	$ 3,857	$ 18,652	$ 8,134

Condensed Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (26,875)	$ (17,595)	$ (50,097)	$ (31,701)
Other comprehensive loss, net of tax:
Unrealized gain on investments	2		30	6
Comprehensive loss	$ (26,873)	$ (17,595)	$ (50,067)	$ (31,695)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Condensed Statements of Redeemable Convertible Preferred Stock, Convertible Preferred Stock and Stockholders' Deficit (Unaudited) - USD ($) $ in Thousands	Total	Redeemable Convertible Preferred Stock	Convertible Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Gain (Loss)	Accumulated Deficit
Beginning balance, shares at Dec. 31, 2017		12,956,724	69,834,789
Beginning balance at Dec. 31, 2017		$ 50,367	$ 122,990
Beginning balance, shares at Dec. 31, 2017				8,287,983
Beginning balance at Dec. 31, 2017	$ (176,986)				$ 4,591	$ (6)	$ (181,571)
Accretion of redeemable convertible preferred stock to redemption value	(1,109)				(1,109)
Accretion of redeemable convertible preferred stock to redemption value		$ 1,109
Issuance of common stock upon exercise of options	39				39
Issuance of common stock upon exercise of options, shares				18,621
Stock-based compensation expense	545				545
Other comprehensive income	6					6
Net loss	(14,106)						(14,106)
Ending balance, shares at Mar. 31, 2018		12,956,724	69,834,789
Ending balance at Mar. 31, 2018		$ 51,476	$ 122,990
Ending balance, shares at Mar. 31, 2018				8,306,604
Ending balance at Mar. 31, 2018	(191,611)				4,066		(195,677)
Beginning balance, shares at Dec. 31, 2017		12,956,724	69,834,789
Beginning balance at Dec. 31, 2017		$ 50,367	$ 122,990
Beginning balance, shares at Dec. 31, 2017				8,287,983
Beginning balance at Dec. 31, 2017	(176,986)				4,591	(6)	(181,571)
Net loss	(31,701)
Ending balance, shares at Jun. 30, 2018		31,053,601	71,832,498
Ending balance at Jun. 30, 2018		$ 144,910	$ 133,192
Ending balance, shares at Jun. 30, 2018				8,324,106
Ending balance at Jun. 30, 2018	(210,213)				3,059		(213,272)
Beginning balance, shares at Mar. 31, 2018		12,956,724	69,834,789
Beginning balance at Mar. 31, 2018		$ 51,476	$ 122,990
Beginning balance, shares at Mar. 31, 2018				8,306,604
Beginning balance at Mar. 31, 2018	(191,611)				4,066		(195,677)
Issuance of convertible preferred stock upon conversion of notes, net of issuance costs		$ 5,452	$ 10,202
Issuance of convertible preferred stock upon conversion of notes, net of issuance costs, shares		1,067,550	1,997,709
Loss on extinguishment of convertible notes	(370)				(370)
Issuance of convertible preferred stock, net of issuance costs		$ 86,640
Issuance of convertible preferred stock, net of issuance costs, shares		17,029,327
Accretion of redeemable convertible preferred stock to redemption value	(1,342)				(1,342)
Accretion of redeemable convertible preferred stock to redemption value		$ 1,342
Issuance of common stock upon exercise of options	24				24
Issuance of common stock upon exercise of options, shares				17,502
Stock-based compensation expense	681				681
Net loss	(17,595)						(17,595)
Ending balance, shares at Jun. 30, 2018		31,053,601	71,832,498
Ending balance at Jun. 30, 2018		$ 144,910	$ 133,192
Ending balance, shares at Jun. 30, 2018				8,324,106
Ending balance at Jun. 30, 2018	$ (210,213)				3,059		(213,272)
Beginning balance, shares at Dec. 31, 2018	104,778,246	31,053,601	73,724,645
Beginning balance at Dec. 31, 2018	$ 294,200	$ 151,381	$ 142,819
Beginning balance, shares at Dec. 31, 2018				8,593,077
Beginning balance at Dec. 31, 2018	(257,690)					(25)	(257,665)
Issuance of convertible preferred stock, net of issuance costs		$ 43,572	$ 26,279
Issuance of convertible preferred stock, net of issuance costs, shares		6,350,345	3,831,766
Accretion of redeemable convertible preferred stock to redemption value	3,355				(3,260)		(95)
Accretion of redeemable convertible preferred stock to redemption value		$ 3,355
Compensation expense related to stock sales by current and former employees	819				819
Issuance of common stock upon exercise of options	1,319				1,319
Issuance of common stock upon exercise of options, shares				739,053
Issuance of common stock upon exercise of warrants, shares				4,935
Issuance of common stock upon exercise of warrants	13				13
Stock-based compensation expense	1,109				1,109
Other comprehensive income	28					28
Net loss	(23,222)						(23,222)
Ending balance, shares at Mar. 31, 2019		37,403,946	77,556,411
Ending balance at Mar. 31, 2019		$ 198,308	$ 169,098
Ending balance, shares at Mar. 31, 2019				9,337,065
Ending balance at Mar. 31, 2019	$ (280,979)					3	(280,982)
Beginning balance, shares at Dec. 31, 2018	104,778,246	31,053,601	73,724,645
Beginning balance at Dec. 31, 2018	$ 294,200	$ 151,381	$ 142,819
Beginning balance, shares at Dec. 31, 2018				8,593,077
Beginning balance at Dec. 31, 2018	(257,690)					(25)	(257,665)
Net loss	$ (50,097)
Ending balance, shares at Jun. 30, 2019	114,960,357	37,403,946	77,556,411
Ending balance at Jun. 30, 2019	$ 367,330	$ 198,228	$ 169,102
Ending balance, shares at Jun. 30, 2019				9,701,266
Ending balance at Jun. 30, 2019	(306,122)			$ 1	1,729	5	(307,857)
Beginning balance, shares at Mar. 31, 2019		37,403,946	77,556,411
Beginning balance at Mar. 31, 2019		$ 198,308	$ 169,098
Beginning balance, shares at Mar. 31, 2019				9,337,065
Beginning balance at Mar. 31, 2019	(280,979)					3	(280,982)
Stock issuance costs		$ (80)	$ 4
Issuance of common stock upon exercise of options	423			$ 1	422
Issuance of common stock upon exercise of options, shares				358,459
Issuance of common stock upon exercise of warrants, shares				5,742
Issuance of common stock upon exercise of warrants	20				20
Stock-based compensation expense	1,287				1,287
Other comprehensive income	2					2
Net loss	$ (26,875)						(26,875)
Ending balance, shares at Jun. 30, 2019	114,960,357	37,403,946	77,556,411
Ending balance at Jun. 30, 2019	$ 367,330	$ 198,228	$ 169,102
Ending balance, shares at Jun. 30, 2019				9,701,266
Ending balance at Jun. 30, 2019	$ (306,122)			$ 1	$ 1,729	$ 5	$ (307,857)

Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net loss	$ (50,097)	$ (31,701)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation and amortization	5,993	4,136
Stock-based compensation expense	2,397	1,226
Change in fair value of convertible note derivative liability		1,248
Bad debt expense	681	333
Compensation expense related to stock sales by current and former employees	819
Change in fair value of convertible preferred stock warrant liability	2,100	183
Accrued interest on convertible notes		223
Accretion of unconditional endowment grant liability	44	53
Accretion of debt discounts	9	97
Amortization of premiums on short-term investments	42	15
Changes in operating assets and liabilities:
Accounts receivable	(2,627)	918
Inventory, net	(2,309)	(1,453)
Prepaid expenses and other current assets	(867)	(3,913)
Other assets	411	70
Accounts payable	157	(1,480)
Accrued consignor payable	(1,855)	(3,872)
Other accrued and current liabilities	(1,744)	4,516
Other noncurrent liabilities	672	695
Net cash used in operating activities	(46,174)	(28,706)
Cash flow from investing activities:
Purchases of investments	(9,151)	(2,211)
Proceeds from maturities of short-term investments	22,898	7,600
Proceeds from sale of short-term investments		7,023
Capitalized proprietary software development costs	(3,887)	(2,245)
Purchases of property and equipment	(10,042)	(4,164)
Net cash (used in) provided by investing activities	(182)	6,003
Cash flow from financing activities:
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs	43,492	86,640
Proceeds from issuance of convertible preferred stock, net of issuance costs	26,283
Proceeds from issuance convertible notes, net of issuance costs		14,273
Proceeds from exercise of stock options and common stock warrants	1,775	63
Payment of deferred offering costs	(3,057)
Issuance cost paid related to conversion of convertible notes		(545)
Repayment of debt	(2,750)	(1,500)
Net cash provided by financing activities	65,743	98,931
Net increase in cash, cash equivalents and restricted cash	19,387	76,228
Cash, cash equivalents, and restricted cash
Beginning of period	45,627	20,660
End of period	65,014	96,888
Supplemental disclosures of cash flow information
Cash paid for interest	219	324
Cash paid for income taxes	141	45
Supplemental disclosures of non-cash investing and financing activities
Issuance of convertible preferred stock upon extinguishment of convertible notes		10,557
Issuance of redeemable convertible preferred stock upon extinguishment of convertible notes		5,642
Accretion of redeemable convertible preferred stock to redemption value	3,355	2,451
Loss on extinguishment of convertible notes		370
Purchases of property and equipment included in accounts payable	(837)	$ (695)
Deferred offering costs in accounts payable and accrued liabilities	$ 2,219

Description of Business and Basis of Presentation

6 Months Ended

Jun. 30, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Description of Business and Basis of Presentation

Note 1. Description of Business and Basis of Presentation

Organization and Description of Business

The RealReal, Inc. (the “Company”) is an online marketplace for authenticated, consigned luxury goods across multiple categories, including women’s, men’s, kids’, jewelry and watches, and home and art. The Company was incorporated in the state of Delaware on March 29, 2011 and is headquartered in San Francisco, California.

Basis of Presentation

The accompanying unaudited condensed financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and the requirements of the U.S. Securities and Exchange Commission (the “SEC”) for interim reporting. The Company’s functional and reporting currency is the U.S. dollar.

The condensed balance sheet as of December 31, 2018 included herein was derived from the audited financial statements as of that date. The accompanying unaudited condensed financial statements have been prepared on the same basis as the annual financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary to state fairly the Company’s financial position, results of operations, comprehensive loss, redeemable convertible preferred stock, convertible preferred stock, and stockholders’ deficit, and cash flows for the periods presented.

These unaudited condensed financial statements should be read in conjunction with the Company’s financial statements and notes included in the final prospectus filed with the SEC pursuant to Rule 424(b) under the Securities Act of 1933, as amended on June 28, 2019 (the “Prospectus”).

Initial Public Offering

The Company’s registration statement on Form S-1 (the “IPO Registration Statement”) related to its initial public offering (“IPO”) was declared effective on June 27, 2019, and the Company’s common stock began trading on the Nasdaq Global Select Market on June 28, 2019. On July 2, 2019, after the quarter end, the Company completed its IPO, selling 15,000,000 shares of common stock at price to the public of $20.00 per share, plus an additional 2,250,000 shares of common stock at a price to the public of $20.00 per share pursuant to the exercise of the underwriters’ option to purchase additional shares. On July 2, 2019, after the quarter end, the Company received aggregate net proceeds of $320.9 million after deducting underwriting discounts and commissions of $24.1 million.

Immediately prior to the completion of the IPO, the Company filed its Amended and Restated Certificate of Incorporation, which authorizes a total of 500,000,000 shares of common stock, and 50,000,000 shares of undesignated preferred stock.

The unaudited pro forma condensed balance sheet data set forth below is presented as if the IPO was completed on June 30, 2019, by applying adjustments to the Company’s historical condensed balance sheet. The pro forma adjustments reflect the issuance of 17,250,000 shares of common stock for aggregate net proceeds of $320.9 million and the reclassification of deferred offering costs of $5.3 million to additional paid-in capital. The proforma adjustments do not include the $3.2 million donation to The RealReal Foundation, which the Company anticipates funding in the latter part of 2019.

The pro forma adjustments also reflect the conversion of 114,960,357 shares of convertible preferred stock and redeemable convertible preferred stock then outstanding into 58,363,606 shares of common stock and the corresponding reclassification of the preferred stock warrant liability to additional paid-in capital upon conversion of all outstanding preferred stock warrants into an aggregate of 103,563 common stock warrants.

	Actual June 30, 2019			Pro Forma Adjustments			Pro Forma June 30, 2019
	(in thousands)
Assets
Total current assets	$	99,430		$	320,850		$	420,280
Total noncurrent assets		58,700			(5,307	)		53,393
Total assets	$	158,130		$	315,543		$	473,673
Liabilities, Redeemable Convertible Preferred Stock, Convertible Preferred Stock and Stockholders’ Equity (Deficit)
Total current liabilities	$	86,846		$	—		$	86,846
Total noncurrent liabilities		10,076			(2,710	)		7,366
Total liabilities		96,922			(2,710	)		94,212
Redeemable convertible preferred stock		198,228			(198,228	)		—
Convertible preferred stock		169,102			(169,102	)		—
Stockholder’s equity (deficit)
Common stock		1			1			2
Additional paid-in capital		1,729			685,582			687,311
Accumulated other comprehensive income		5			—			5
Accumulated deficit		(307,857	)		—			(307,857	)
Total stockholders’ equity (deficit)		(306,122	)		685,583			379,461
Total liabilities, redeemable convertible preferred stock, convertible preferred stock, and stockholders’ equity (deficit)	$	158,130		$	315,543		$	473,673

Reverse Stock Split

On June 13, 2019 the Company effected a reverse split of shares of the Company’s common stock on a 1-for-2 basis (the “Reverse Stock Split”). All issued and outstanding shares of common stock, warrants for common stock, options to purchase common stock and the related per share amounts contained in the financial statements have been retroactively adjusted to reflect this Reverse Stock Split for all periods presented. The par value and authorized shares of common stock were not adjusted as a result of the Reverse Stock Split. Additionally, the authorized, issued and outstanding shares of redeemable convertible preferred stock and convertible preferred stock and their related per share amounts, other than the conversion price per share, were not adjusted as a result of the Reverse Stock Split.

Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Note 2. Summary of Significant Accounting Policies

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of expenses during the reporting period. Significant items subject to such estimates and assumptions include those related to revenue recognition, including the returns reserve and material right related to the Company’s tiered consignor commission plan, valuation of inventory, stock-based compensation, redemption value of redeemable convertible preferred stock, and other contingencies. The Company evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors and adjusts those estimates and assumptions when facts and circumstances dictate. Actual results could differ from those estimates.

Net Loss per Share Attributable to Common Stockholders

The Company follows the two-class method when computing net loss per common share when shares are issued that meet the definition of participating securities. The two-class method determines net loss per common share for each class of common stock and participating securities according to dividends declared or accumulated and participation rights in undistributed earnings. The two-class method requires income available to common stockholders for the period to be allocated between common stock and participating securities based upon their respective rights to receive dividends as if all income for the period had been distributed. The Company’s redeemable convertible preferred stock and convertible preferred stock contractually entitles the holders of such shares to participate in dividends but does not contractually require the holders of such shares to participate in the Company’s losses.

For periods in which the Company reports net losses, diluted net loss per common share attributable to common stockholders is the same as basic net loss per common share attributable to common stockholders, because potentially dilutive common shares are not assumed to have been issued if their effect is anti-dilutive.

Revenue Recognition

The Company generates revenue from the sale of pre-owned luxury goods through its online marketplace.

Consignment and Service Revenue

The Company provides a service to sell pre-owned luxury goods on behalf of consignors to buyers through its online marketplace and retail locations. The Company retains a percentage of the proceeds received as payment for its consignment service, which the Company refers to as its take rate. The Company reports consignment revenue on a net basis as an agent and not the gross amount collected from the buyer. Title to the consigned goods remain with the consignor until transferred to the end customer subsequent to purchase of the consigned goods. The Company does not take title of consigned goods at any time except in certain cases where returned goods become Company-owned inventory.

The Company recognizes consignment revenue upon purchase of the consigned good by the buyer as its performance obligation of providing consignment services to the consignor is satisfied at that point. Consignment revenue is recognized net of certain buyer incentives and estimated returns and cancellations. The Company recognizes a returns reserve, based on historical experience, which is recorded in other accrued and current liabilities on the balance sheets (see Note 5). Sales tax assessed by governmental authorities is excluded from revenue.

Certain transactions provide consignors with a material right resulting from the tiered consignor commission plan. Under this plan, the amount an individual consignor receives for future sales of consigned goods may be dependent on previous consignment sales for that consignor within his/her consignment period. Accordingly, in certain consignment transactions, a small portion of the Company’s consignment revenue is allocated to such material right using the portfolio method and recorded as deferred revenue.

The Company charges shipping fees to buyers and has elected to treat shipping and handling activities performed after control transfers to the buyer as fulfillment activities. All outbound shipping and handling costs are accounted for as fulfillment costs in cost of consignment and service revenue at the time revenue is recognized.

The Company also generates subscription revenue from monthly memberships allowing buyers early access to shop for luxury goods. The buyers receive the early access and other benefits over the term of the subscription period, which represents a single stand-ready performance obligation. Therefore, the subscription fees paid by the buyer are recognized over the monthly subscription period. Subscription revenue was not material in the three or six months ended June 30, 2019 and 2018.

Direct Revenue

The Company generates direct revenue from the sale of Company-owned inventory. The Company recognizes direct revenue upon shipment of the purchased good to the buyer as its performance obligation, consisting of the sale of goods, is satisfied at this point. Direct revenue is recognized net of incentives and estimated returns. Sales tax assessed by governmental authorities is excluded from revenue.

Incentives

Promotional incentives, which include basket promotional code discounts and other credits, may periodically be offered to consignors and buyers. These are treated as a reduction of consignment and service revenue and direct revenue. Additionally, the Company may offer site credits to buyers on current transactions to be applied towards future transactions, which are accounted as site credit liabilities and included in other accrued and current liabilities on the balance sheets.

Contract Liabilities

The Company’s contractual liabilities consist of deferred revenue for material rights primarily related to the tiered consignor commission plan totaling $3.3 million as of June 30, 2019 and $2.7 million as of December 31, 2018, which are recognized as revenue using a portfolio approach based on the pattern of exercise and certain unredeemed site credits, which were immaterial as of June 30, 2019 and December 31, 2018. Contract liabilities are recorded in other accrued and current liabilities on the balance sheets and are generally expected to be recognized within one year.

Cost of Revenue

Cost of revenue for consignment and services and direct revenue consists of shipping costs, credit card fees, packaging, customer service and website hosting services. Cost of direct revenue also includes the cost of goods sold.

Stock-based Compensation

Stock-based compensation expense related to employees is measured based on the grant-date fair value of the awards. Compensation expense is recognized in the statements of operations over the period during which the employee is required to perform services in exchange for the award (the vesting period of the applicable award) using the straight-line method. The Company estimates the fair value of stock options granted using the Black-Scholes option pricing model and accounts for forfeitures as they occur.

Historically, certain employees were able to sell their shares of the Company’s common stock to the Company’s existing investors. In such secondary sale transactions, the Company recorded the difference in purchase price and the fair value of such shares as compensation expense within selling, general and administrative in the statement of operations and a corresponding credit to additional paid-in capital.

Cash, Cash Equivalents and Restricted Cash

The Company considers all highly liquid investments purchased with original maturities of three months or less from the purchase date to be cash equivalents. Cash equivalents consist primarily of amounts invested in reverse repurchase agreement (“RRAs”). RRAs are collateralized by deposits in the form of United States government securities and obligations for an amount not less than 102% of their value. The Company has a policy that the collateral has at least an A (or equivalent) credit rating. The Company utilizes a third-party custodian to manage the exchange of funds and ensure that collateral received is maintained at 102% of the value of the RRAs on a daily basis. RRAs with stated maturities of greater than three months from the date of purchase are classified as short-term investments.

Restricted cash consists of cash deposited with a financial institution as collateral for the Company’s letters of credit for its facility leases and the Company’s credit cards. As of June 30, 2019 and December 31, 2018, the Company had letters of credit outstanding and collateral accounts in the amounts of $11.7 million and $11.2 million, respectively. The restricted cash is classified as noncurrent as the Company expects the cash to remain restricted for a period greater than one year.

The following table provides a reconciliation of cash, cash equivalents and restricted cash that sum to the total of the same amounts shown in the statements of cash flows (in thousands):

	June 30, 2019		June 30, 2018
Cash and cash equivalents	$	53,314	$	91,216
Restricted cash		11,700		5,672
Total cash, cash equivalents and restricted cash	$	65,014	$	96,888

Inventory, Net

Inventory primarily consists of finished goods arising from goods returned after the consignor has been paid, upon which the Company assumes the title to the goods until it is resold and recognizes it as inventory in an amount equal to that paid to the consignor. The Company also periodically purchases finished goods directly from vendors. Inventory is valued at the lower of cost and net realizable value using the specific identification method, and the Company records provisions, as appropriate, to write down obsolete and excess inventory to estimated net realizable value.

The inventory reserve, which reduces inventory on the balance sheets, was $1.2 million and $0.7 million as of June 30, 2019 and December 31, 2018, respectively.

Software Development Costs

Proprietary software includes the costs of developing the Company’s internal proprietary business platform. The Company capitalizes qualifying proprietary software development costs that are incurred during the application development stage. Capitalization of costs begins when two criteria are met: (1) the preliminary project stage is completed and (2) it is probable that the software will be completed and used for its intended function. Such costs are capitalized in the period incurred. Capitalization ceases and amortization begins when the software is substantially complete and ready for its intended use, including the completion of all significant testing. Costs related to preliminary project activities and post-implementation operating activities are expensed as incurred.

Accretion of Redeemable Convertible Preferred Stock

The carrying value of the redeemable convertible preferred stock that is probable of redemption is accreted to redemption value from the date of issuance to the earliest redemption date using the effective interest method. Increases to the carrying value of redeemable convertible preferred stock recognized in each period are charged to additional paid-in capital, or in the absence of additional paid-in capital, charged to accumulated deficit.

Convertible Preferred Stock Warrant Liability

The Company issued convertible preferred stock warrants in conjunction with the issuance of debt. Such warrants are recorded as other noncurrent liabilities on the balance sheets at their estimated fair value because the shares underlying the warrants may obligate the Company to transfer assets to the holders at a future date under certain circumstances such as a deemed liquidation event. The warrants are subject to re-measurement at each balance sheet date and the change in fair value, if any, is included in other expense, net. The Company continued to remeasure these warrants until the earlier of the expiration, exercise or conversion of the convertible preferred stock warrants into common warrants, which occurred upon the completion of the IPO on July 2, 2019. In connection with the completion of the IPO, the convertible preferred stock warrants automatically converted into common stock warrants. Upon conversion of the convertible preferred stock warrants, the related convertible preferred stock warrant liability was reclassified to additional paid-in capital.

Leases

Leases are reviewed for classification as operating or capital leases. For operating leases, the Company recognizes rent on a straight-line basis over the term of the lease. The Company records the difference between cash payments and rent expense recognized as a deferred rent liability included in other accrued and current liabilities and other noncurrent liabilities on the balance sheets. Incentives granted under the Company’s facility leases, including allowances to fund leasehold improvements, are deferred and are recognized as adjustments to rental expense on a straight-line basis over the term of the lease.

Concentrations of Credit Risks

Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash and cash equivalents. At times, such amount may exceed federally-insured limits. The Company reduces credit risk by placing its cash and cash equivalents with major credit-worthy financial institutions within the United States.

As of June 30, 2019 and December 31, 2018, there were no customers that represented 10% or more of the Company’s accounts receivable balance and there were no customers that individually exceeded 10% of the Company’s total revenue for each of the three and six months ended June 30, 2019 and 2018.

Recently Adopted Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (“ASU”) 2014-09, Revenue from Contracts with Customers (ASC 606), which supersedes the existing revenue recognition requirements and requires entities to recognize revenue when control of the promised goods or services is transferred to customers at an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. The Company adopted ASC 606 as of January 1, 2018 using the full retrospective transition method.

In June 2018, the FASB issued ASU 2018-08, Clarifying the Scope and the Accounting Guidance for Contributions Received and Contributions Made (Topic 958), which clarified the accounting for contributions made or received by business entities. The Company adopted this guidance beginning on January 1, 2018 using the modified prospective transition. Adoption of the standard did not have a material impact on its financial statements.

In August 2018, the FASB issued ASU 2018-15, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40). ASU 2018-15 clarifies and aligns the accounting for implementation costs for hosting arrangements with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The Company has early adopted this standard effective January 1, 2018 on a prospective basis, which did not have a material impact on its financial statements.

Recently Issued Accounting Pronouncements

In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (Subtopic 825-10), which will change how to recognize, measure, present and make disclosures about certain financial assets and financial liabilities. Under this standard, if an entity designates a financial liability under the fair value option in accordance with ASC 825, the entity shall measure the financial liability at fair value with qualifying changes in fair value recognized in net income. The entity shall present separately in other comprehensive loss the portion of the total change in the fair value of the liability that results from a change in the instrument-specific credit risk. ASU 2016-01 is effective for the Company for annual and interim periods within fiscal years beginning after December 15, 2019. The Company does not expect the adoption of this standard to have a material impact on the operating results.

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). ASU 2016-02 is aimed at making leasing activities more transparent and comparable and requires substantially all leases to be recognized by lessees on their balance sheet as a right-of-use asset and corresponding lease liability, including leases currently accounted for as operating leases. The new standard is effective for non-public entities in fiscal years beginning after December 15, 2019. Therefore, as an “emerging growth company” as defined in the JOBS Act, the new standard is effective for the Company beginning January 1, 2020. Under the JOBS Act, emerging growth companies can delay adopting new or revised accounting standards issued subsequent to the enactment of the JOBS Act until such time as those standards apply to private companies. The Company is currently evaluating the impact that this standard will have on its financial statements but expects that it will result in a significant increase in its long-term assets and liabilities.

In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2016-13 “Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” The standard amended guidance on reporting credit losses for assets held at amortized cost basis and available for sale debt securities. For available for sale debt securities, credit losses will be presented as an allowance rather than as a write-down. This standard is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for all entities. The Company does not expect the adoption of this standard to have a material impact on the operating results.

In June 2018, the FASB issued ASU 2018-07, Compensation—Stock Compensation (Topic 718), which expands the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from non-employees. The standard is effective for fiscal years beginning after December 15, 2019, including interim reporting periods within that fiscal year. Early adoption is permitted, but no earlier than the Company’s adoption date of ASC 606. The Company does not expect the adoption of this standard to have a material impact on the operating results.

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820). This standard modifies disclosure requirements related to fair value measurement and is effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted. Implementation on a prospective or retrospective basis varies by specific disclosure requirement. The standard also allows for early adoption of any removed or modified disclosures upon issuance while delaying adoption of the additional disclosures until their effective date. The Company is currently evaluating the impact that this standard will have on its financial statements.

Cash, Cash Equivalents and Short Term Investments

6 Months Ended

Jun. 30, 2019

Cash And Cash Equivalents [Abstract]

Cash, Cash Equivalents, and Short-Term Investments

Note 3. Cash, Cash Equivalents and Short-Term Investments

The following tables summarize the estimated value of the Company’s cash, cash equivalents and short-term investments (in thousands):

	June 30, 2019
	Amortized Cost		Unrealized Gain		Unrealized Loss		Fair Value
Cash and cash equivalents:
Cash	$	35,479	$	—	$	—	$	35,479
Money market fund		5,835		—		—	$	5,835
Reverse repurchase agreements		12,000		—		—		12,000
Total cash and cash equivalents	$	53,314	$	—	$	—	$	53,314
Short-term investments:
U.S. corporate bonds	$	9,172	$	4		—	$	9,176
International corporate bonds		4,195		1		—	$	4,196
Total short-term investments	$	13,367	$	5	$	—	$	13,372

	December 31, 2018
	Amortized Cost		Unrealized Gain		Unrealized Loss			Fair Value
Cash and cash equivalents:
Cash	$	10,253	$	—	$	—		$	10,253
Money market fund		140		—		—			140
Reverse repurchase agreements		24,000		—		—			24,000
Total cash and cash equivalents	$	34,393	$	—	$	—		$	34,393
Short-term investments:
U.S. corporate bonds	$	21,184	$	—	$	(19	)	$	21,165
International corporate bonds		5,972		—		(6	)		5,966
Total short-term investments	$	27,156	$	—	$	(25	)	$	27,131

As of June 30, 2019 and December 31, 2018, the contractual maturity for the short-term investments is less than one year. For the three and six months ended June 30, 2019 and 2018, the Company recognized no material realized gains or losses on short-term investments.

Fair Value Measurement

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurement

Note 4. Fair Value Measurement

Assets and liabilities recorded at fair value on a recurring basis on the balance sheets are categorized based upon the level of judgment associated with the inputs used to measure their fair values. Fair value is defined as the exchange price that would be received for an asset or an exit price that would be paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The authoritative guidance on fair value measurements establishes a three-tier fair value hierarchy for disclosure of fair value measurements as follows:

Level 1—Observable inputs such as unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date.

Level 2—Inputs (other than quoted prices included in Level 1) are either directly or indirectly observable for the asset or liability. These include quoted prices for similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that are not active.

Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

There were no transfers between Level 1, Level 2 or Level 3 of the fair value hierarchy during the periods presented.

The following tables provide the financial instruments measured at fair value (in thousands):

	June 30, 2019
	Level 1		Level 2		Level 3		Total
Assets
Cash equivalents:
Money market fund	$	5,835	$	—	$	—	$	5,835
Reverse repurchase agreements		—		12,000		—	$	12,000
Total cash equivalents	$	5,835	$	12,000	$	—	$	17,835
Short-term investments:
U.S. corporate bonds	$	—	$	9,176	$	—	$	9,176
International corporate bonds		—		4,196		—	$	4,196
Total short-term investments	$	—	$	13,372	$	—	$	13,372
Total assets	$	5,835	$	25,372	$	—	$	31,207
Liabilities
Convertible preferred stock warrant liability	$	—	$	—	$	2,710	$	2,710
Total liabilities	$	—	$	—	$	2,710	$	2,710

	December 31, 2018
	Level 1		Level 2		Level 3		Total
Assets
Cash equivalents:
Money market fund	$	140	$	—	$	—	$	140
Reverse repurchase agreements		—		24,000		—		24,000
Total cash equivalents	$	140	$	24,000	$	—	$	24,140
Short-term investments:
U.S. corporate bonds	$	—	$	21,165	$	—	$	21,165
International corporate bonds		—		5,966		—		5,966
Total short-term investments	$	—	$	27,131	$	—	$	27,131
Total assets	$	140	$	51,131	$	—	$	51,271
Liabilities
Convertible preferred stock warrant liability	$	—	$	—	$	610	$	610
Total liabilities	$	—	$	—	$	610	$	610

The fair value of the convertible preferred stock warrant liability on the date of issuance and each re-measurement date was estimated using the Black‑Scholes option pricing model. Inputs used to determine the estimated fair value as of each valuation date included expected term of the warrants, the risk-free interest rate, volatility, and the fair value of underlying shares. Due to the nature of these inputs, the valuation of the warrants is considered a Level 3 measurement. The following table presents a rollforward of the fair value of the level 3 liabilities recorded at fair value at June 30, 2019 (in thousands):

	Convertible Preferred Stock Warrant Liability
Balance as of December 31, 2018	$	610
Changes in estimated fair value		2,100
Balance as of June 30, 2019	$	2,710

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Balance Sheet Components

6 Months Ended

Jun. 30, 2019

Balance Sheet Related Disclosures [Abstract]

Balance Sheet Components

Note 5. Balance Sheet Components

Property and Equipment, Net

Property and equipment, net is recorded at cost less accumulated depreciation and amortization. Depreciation and amortization are recorded on a straight-line basis over the estimated useful lives of the respective assets. Property and equipment, net consists of the following (in thousands):

	June 30, 2019			December 31, 2018
Proprietary software	$	17,939		$	14,052
Furniture and equipment		16,877			12,665
Automobiles		516			346
Leasehold improvements		30,515			25,702
		65,847			52,765
Less: accumulated depreciation and amortization		(25,420	)		(19,479	)
Property and equipment, net	$	40,427		$	33,286

Depreciation and amortization expense on property and equipment was $3.2 million and $2.1 million for the three months ended June 30, 2019 and 2018, respectively, and $6.0 million and $4.1 million for the six months ended June 30, 2019 and 2018, respectively.

Other Accrued and Current Liabilities

Other accrued and current liabilities consist of the following (in thousands):

	June 30, 2019		December 31, 2018
Returns reserve	$	8,678	$	14,311
Accrued compensation		8,833		8,078
Site credit liability		5,921		4,700
Accrued sales tax and other taxes		3,170		4,476
Deferred revenue		3,943		3,184
Accrued marketing and outside services		6,558		4,152
Other		5,372		3,055
Other accrued and current liabilities	$	42,475	$	41,956

Debt and Convertible Preferred Stock Warrants

6 Months Ended

Jun. 30, 2019

Debt Disclosure [Abstract]

Debt and Convertible Preferred Stock Warrants

Note 6. Debt and Convertible Preferred Stock Warrants

Term Loans

In 2013, the Company entered into an agreement to obtain a term loan facility (“Term Loan Facility”) in the amount of $5.0 million for general corporate purposes and working capital expenditures. In 2014, 2015 and 2016, the Company amended its Term Loan Facility to increase the amount borrowed under the facility by $11.6 million. The Term Loan Facility is secured by liens on substantially all of the Company’s present and future assets.

The Term Loan Facility includes affirmative, negative and financial covenants that restrict the Company’s ability to, among other things, incur additional indebtedness, make investments, sell or otherwise dispose of assets, pay dividends or repurchase stock. The Term Loan Facility’s financial covenants required the Company to achieve at least 80% of its forecasted gross revenue and a liquidity ratio on a monthly basis. As of June 30, 2019, the Company was in compliance with all covenants.

In 2017, the Company executed the eighth amendment (“Eight Amendment”) to the Term Loan Facility. The Eighth Amendment refinanced the $15.0 million repayment schedule to be two term loans, which included a $7.5 million interest only term loan with a maturity date of January 31, 2019 (“Term Loan I”), and the remaining $7.5 million under the existing Term Loan Facility with a maturity date of January 1, 2020 (“Term Loan II”) (together the “Term Loans”).

In 2018, the Company entered into the ninth, tenth, eleventh, and twelfth amendment (“Ninth Amendment,” “Tenth Amendment,” “Eleventh Amendment” and “Twelfth Amendment”) to the existing Term Loans. The Ninth Amendment removed the liquidity ratio covenant, amended Term Loan I to be due in 30 equal monthly installments, plus all accrued interest, beginning July 31, 2018, increased the variable annual interest rate from 0.10% above the prime rate to 0.35% above the prime rate and extended the maturity date of Term Loan I to January 31, 2021.

The Eighth Amendment and Ninth Amendment required the Company to pay a combined success fee of $0.3 million upon (1) any sale or licensing of all or substantially all of the Company’s assets, (2) any change in control of the Company, or (3) an initial public offering of the Company’s equity securities. The Ninth Amendment also required the Company to pay an additional success fee of $0.1 million upon the sale or issuance of the Company’s equity securities or subordinated debt securities for net cash proceeds of at least $50.0 million on or prior to June 30, 2018. The Company paid the $0.1 million success fee upon the Series G convertible preferred stock financing in June 2018.

The Tenth and Twelfth Amendments adjusted and waived certain covenant violations which were subsequently amended and met. The Eleventh Amendment provided an additional letter of credit of $1.5 million for corporate credit cards with a maturity date of August 1, 2019.

During the three months ended, June 30, 2019, the Company recorded interest expense related to the Term Loans of $0.4 million which included the success fee of $0.3 million. During the three months ended June 30, 2018, the Company recorded interest expense related to the Term Loans of $0.1 million. During the six months ended June 30, 2019 and 2018, the Company recorded interest expense related to the Term Loans of $0.5 million and $0.3 million, respectively.

On July 26, 2019 the Company fully repaid the principal of its Terms Loans in the amount of $6.5 million and as such the entire balance is recorded in current liabilities.

Warrants Issued with Term Loan Facility

During the period from 2013 to 2016, in connection with the Term Loan Facility, the Company issued convertible preferred stock warrants, which included warrants to purchase 131,652 shares of its Series B convertible preferred stock with an exercise price of $1.03 per share, 6,868 shares of its Series C convertible preferred stock with an exercise price of $2.18 per share, 43,010 shares of its Series D convertible preferred stock with an exercise price of $2.79 per share and 25,597 shares of its Series E convertible preferred stock with an exercise price of $2.93 per share (together the “Convertible Preferred Stock Warrants”). The Convertible Preferred Stock Warrants were exercisable from the date of issuance and have a 10-year term. The initial estimated fair value of the Convertible Preferred Stock Warrants was recorded as convertible preferred stock warrant liability with an offset to the debt discount associated with the Term Loan Facility. The debt discount is amortized to interest expense over the repayment period of the loan using the effective-interest method. All Convertible Preferred Stock Warrants were unexercised and outstanding as of June 30, 2019 and December 31, 2018.

Convertible Notes

6 Months Ended

Jun. 30, 2019

Debt Disclosure [Abstract]

Convertible Notes

Note 7. Convertible Notes

In April 2018, the Company issued $14.4 million in convertible notes (“Convertible Notes”) to existing shareholders of redeemable convertible and convertible preferred stock. Interest accrued on the principal balance at an annual rate of 8%. Principal and accrued interest were due at the earliest of (1) the one-year anniversary of the issuance date, (2) event of default and (3) a change of control, defined as either a merger, sale of stock or assets or other form of transaction.

The maturity date could be extended if agreed upon by the Company and investors holding the convertible notes representing at least 80% of the outstanding amount at such time. On change of control, the holders of convertible notes could elect to either (1) receive full repayment of the note outstanding or (2) convert the entire outstanding amount of principal and accrued interest into shares of Series F preferred stock at a price per share of $3.8590.

The outstanding balance of principal and accrued interest automatically converts into fully paid and nonassessable shares of preferred stock issued on the issuance of preferred stock with aggregate gross proceeds of at least $25.0 million (a “Qualified Financing”) prior to the maturity date of the convertible notes. On the issuance of preferred stock with aggregate gross proceeds of less than $25.0 million (a “Non-Qualified Financing”), holders of the Convertible Notes could elect to convert all or any portion of the outstanding principal and interest into fully paid and nonassessable shares of preferred stock. On conversion of the convertible notes in either a Qualified Financing or Non-Qualified Financing, preferred shares would be issued at a price of 90% of the price per share paid by the purchasers of preferred stock participating in the financing.

The Qualified Financing and Non-Qualified Financing redemption features were determined to be a compound embedded derivative requiring bifurcation and separate accounting at its estimated fair value. On issuance of the Convertible Notes, the Company recognized a liability of $0.4 million for the estimated fair value of the embedded derivative and incurred $0.1 million in debt issuance costs, both of which were recorded as a debt discount associated with the Convertible Notes.

During the three and six months ended June 30, 2018, the Company recognized $0.2 million of interest expense related to the Convertible Notes. The Company also recognized an expense of $1.2 million during the three and six months ended June 30, 2018 related to the change in fair value of the Convertible Notes embedded derivative liability, which was included in other expense, net in the statements of operations.

In June 2018, the outstanding balance of principal and accrued interest on the Convertible Notes of $14.6 million converted into 1,067,550 and 1,997,709 shares of the Company’s Series G redeemable convertible and convertible preferred stock, respectively, at a price of $4.7565 per share in conjunction with the Company’s Series G convertible preferred stock financing, which was a Qualified Financing under the terms of the Convertible Notes. The conversion of the Convertible Notes into Series G redeemable convertible preferred stock and Series G convertible preferred stock was accounted for as an extinguishment. The extinguishment of the Convertible Notes was considered a capital transaction and accordingly, the Company recognized a $0.4 million loss on extinguishment through additional paid in capital equal to the unamortized debt discount at the date of conversion.

Convertible Preferred Stock and Redeemable Convertible Preferred Stock

6 Months Ended

Jun. 30, 2019

Temporary Equity Disclosure [Abstract]

Convertible Preferred Stock and Redeemable Convertible Preferred Stock

Note 8. Convertible Preferred Stock and Redeemable Convertible Preferred Stock

On July 2, 2019 and immediately prior to the completion of the IPO, all outstanding shares of convertible preferred stock and redeemable convertible preferred stock then outstanding converted into 58,363,606 shares of common stock. The carrying value of the redeemable convertible preferred stock is accreted to redemption value from the date of issuance to the earliest redemption date using the effective interest method. Due to the IPO becoming effective in the second quarter of 2019, the Company determined that redemption of the redeemable convertible preferred stock was not probable and as such, did not record accretion for the three months ended June 30, 2019. Convertible preferred stock and redeemable convertible preferred stock consisted of the following (in thousands, except share amounts):

	June 30, 2019
	Shares Authorized		Shares Issued and Outstanding		Net Carrying Value		Aggregate Liquidation Preference
Series A		18,960,000		18,941,619	$	9,161	$	9,217
Series B		13,784,443		13,652,791		13,774		14,000
Series C		9,335,659		9,328,791		20,289		20,374
Series D		14,367,652		14,324,642		39,886		40,000
Series E		13,612,543		13,586,946		39,880		40,000
Series F		12,956,724		12,956,724		56,154		59,623
Series G		21,986,733		21,986,733		118,325		126,444
Series H		10,182,113		10,182,111		69,861		71,539
Total		115,185,867		114,960,357	$	367,330	$	381,197

	December 31, 2018
	Shares Authorized		Shares Issued and Outstanding		Net Carrying Value		Aggregate Liquidation Preference
Series A		18,960,000		18,941,619	$	9,161	$	9,217
Series B		13,784,443		13,652,791		13,774		14,000
Series C		9,335,659		9,328,791		20,289		20,374
Series D		14,367,652		14,324,642		39,886		40,000
Series E		13,612,543		13,586,946		39,880		40,000
Series F		12,956,724		12,956,724		54,968		57,211
Series G		21,986,733		21,986,733		116,242		120,544
Total		105,003,754		104,778,246	$	294,200	$	301,346

Share-based Compensation Plans

6 Months Ended

Jun. 30, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Share-based Compensation Plans

Note 9. Share-based Compensation Plans

2011 Equity Incentive Plan

In 2011, the Company adopted the Equity Incentive Plan (2011 Plan) authorizing the granting of incentive stock options (ISOs) and non-statutory stock options (NSOs) to eligible participants for up to 12,987,255 shares of common stock. Under the 2011 Plan, incentive stock options and non-statutory stock options are to be granted at an exercise price that is no less than 100% of the fair value of the stock at the date of grant. Options generally vest over four years and are exercisable for up to 10 years after the date of grant. Incentive stock options granted to stockholders who own more than 10% of the outstanding stock of the Company at the time of grant must be issued at an exercise price no less than 110% of the fair value of the stock on the date of grant. The 2011 Plan has been replaced by the Company’s 2019 Plan as defined below with respect to future equity awards.

2019 Equity Incentive Plan

In connection with the Company’s initial public offering, the Company adopted the 2019 Equity Incentive Plan (the “2019 Plan”). The 2019 Plan allows the Company to grant stock options, stock appreciation rights, restricted stock, restricted stock units and performance awards to participants. Subject to the terms and conditions of the 2019 Plan, the initial number of shares authorized for grants under the 2019 Plan is 8,000,000.

Employee Stock Purchase Plan

In connection with the Company’s initial public offering, the Company adopted the Employee Stock Purchase Plan. The Employee Stock Purchase Plan permits employees to purchase shares of common stock during six-month offering periods at a purchase price equal to the lesser of (1) 85% of the fair market value of a share of common stock on the first business day of such offering period and (2) 85% of the fair market value of a share of common stock on the last business day of such offering period. The plan is considered compensatory and, as such, the purchase discount from market price purchased by employees will be recorded as compensation expense. As of June 30, 2019, the maximum number of shares of common stock that can be issued under the employee stock purchase plan was 1,750,000 shares.

Stock-based Compensation

Total stock-based compensation expense, excluding compensation expense related to stock sales by current and former employees, by function was as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Marketing	$	74	$	39	$	143	$	72
Operations and technology		476		263		966		536
Selling, general and administrative		737		379		1,288		618
Total	$	1,287	$	681	$	2,397	$	1,226

The amounts presented in the above table exclude compensation expense related to the stock sales by current and former employees. In March 2019, executives of the Company sold an aggregate of 382,477 shares of the Company’s common stock at a price of $12.72 per share for an aggregate amount of $4.9 million to certain of the Company’s existing investors. The Company determined that the purchase price was in excess of the fair value of such shares. As a result, during the three months ended March 31, 2019, the Company recorded the excess of the purchase price above fair value of $0.8 million as compensation expense within selling, general and administrative in the statement of operations and a corresponding credit to additional paid-in capital.

Commitments and Contingencies

6 Months Ended

Jun. 30, 2019

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

Note 10. Commitments and Contingencies

Leases

The Company leases its corporate offices, retail spaces and merchandising and fulfillment facilities under various noncancelable operating leases with terms ranging from one year to eleven years. Rent expense from operating leases totaled $4.6 million and $2.2 million for the three months ended June 30, 2019 and 2018, respectively and $8.7 million and $4.2 million for the six months ended June 30, 2019 and 2018, respectively. The current portion of deferred rent was $0.9 million as of June 30, 2019 and is included in other accrued and current liabilities on the balance sheets. The noncurrent portion of deferred rent was $6.0 million as of June 30, 2019 and is included in other noncurrent liabilities on the balance sheets.

As of June 30, 2019, the Company’s future minimum lease payments under the noncancelable leases are as follows (in thousands):

Year Ending December 31,	Operating Leases
2019	$	8,554
2020		17,753
2021		17,718
2022		14,941
2023		13,693
Thereafter		56,145
Total future minimum payments	$	128,804

Noncancelable Purchase Commitments

The Company has commitments for cloud services and other items in the ordinary course of business with varying expiration terms through 2021. As of June 30, 2019, there were no material changes to the Company’s noncancelable purchase commitments disclosed in the financial statements in the Prospectus.

Other Commitments

In January 2018, the Company and the University of Arizona Foundation entered into an endowment agreement (the “Endowment Agreement”) to establish a fund (the “Fund”) to create and grow a gemology degree program in the Department of Geosciences at the University of Arizona (the “University”). The Company agreed to donate a total of $2.0 million, payable in four annual installments of $0.5 million. The first installment was paid in January 2018 on execution of the Endowment Agreement.

There are no conditions that the University must meet to receive the funds nor any penalties to the University for nonperformance. The Endowment Agreement directs the use of the funds but contains no binding restrictions on the use of the funds. On the execution of the Endowment Agreement, the Company recognized $1.7 million expense for the estimated fair value of the grant, using a discount rate of 10%, to selling, general and administrative expenses in the statements of operations. The Company recognized a corresponding liability for the remaining installment payments and will recognize accretion of the liability as interest expense over the remaining term of the Endowment Agreement.

Interest expense related to the accretion of the grant liability was not material in the three and six months ended June 30, 2019 and 2018. As of June 30, 2019, the outstanding liability was $1.4 million, of which $1.0 million is included in other accrued and current liabilities on the balance sheet and $0.4 million is included in other noncurrent liabilities on the balance sheet.

Contingencies

From time to time the Company is subject to, and it is presently involved in, litigation and other legal proceedings. Accounting for contingencies requires the Company to use judgment related to both the likelihood of a loss and the estimate of the amount or range of loss. The Company records a loss contingency when it is probable that a liability has been incurred and the amount of the loss can be reasonably estimated. The Company discloses material contingencies when a loss is not probable but reasonably possible.

On November 14, 2018, Chanel, Inc. (“Chanel”) filed a lawsuit against the Company in the U.S. District Court for the Southern District of New York bringing various trademark- and advertising-related claims under the Lanham Act and New York state law analogues. Chanel alleges that the Company’s resale of Chanel products confuses consumers into believing that Chanel is affiliated with the Company and involved in authenticating consignors’ goods and that only Chanel is capable of authenticating second-hand Chanel goods. Chanel alleges, in particular, that the Company has made false representations concerning the Chanel-branded goods sold on our platform and that a number of these goods were counterfeit. The lawsuit seeks money damages as well as injunctive relief. The Company believes that it has meritorious defenses and intends to defend this lawsuit vigorously. The Company is not able to predict or reasonably estimate the ultimate outcome or possible losses relating to this claim.

Indemnifications

In the ordinary course of business, the Company may provide indemnifications of varying scope and terms to vendors, directors, officers and other parties with respect to certain matters. The Company has not incurred any material costs as a result of such indemnifications and have not accrued any liabilities related to such obligations in its financial statements.

Net Loss Per Share

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Net Loss Per Share

Note 12. Net Loss Per Share

A reconciliation of the numerator and denominator used in the calculation of the basic and diluted net loss per share attributable to common stockholders is as follows (in thousands, except share and per share data):

	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Numerator
Net loss attributable to common stockholders	$	(26,875	)	$	(18,937	)	$	(53,452	)	$	(34,152	)
Denominator
Weighted-average common shares outstanding used to calculate net loss per share attributable to common stockholders, basic and diluted		9,494,447			8,314,251			9,102,234			8,307,010
Net loss per share attributable to common stockholders, basic and diluted	$	(2.83	)	$	(2.28	)	$	(5.87	)	$	(4.11	)

The following securities were excluded from the computation of diluted net loss per share attributable to common stockholders for the periods presented, because including them would have been anti-dilutive (on an as-converted basis):

	June 30,
	2019		2018
Convertible preferred stock		38,778,180		35,916,225
Redeemable convertible preferred stock		19,585,426		16,410,256
Options to purchase common stock		9,537,699		8,703,564
Warrants to purchase convertible preferred stock		103,563		103,563
Warrant to purchase common stock		—		67,974
Total		68,004,868		61,201,582

Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

Use of Estimates

Net Loss per Share Attributable to Common Stockholders

Revenue Recognition

The Company generates revenue from the sale of pre-owned luxury goods through its online marketplace.

Consignment and Service Revenue

Direct Revenue

Incentives

Contract Liabilities

Cost of Revenue

Stock-based Compensation

Cash, Cash Equivalents and Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash that sum to the total of the same amounts shown in the statements of cash flows (in thousands):

	June 30, 2019		June 30, 2018
Cash and cash equivalents	$	53,314	$	91,216
Restricted cash		11,700		5,672
Total cash, cash equivalents and restricted cash	$	65,014	$	96,888

Inventory, Net

The inventory reserve, which reduces inventory on the balance sheets, was $1.2 million and $0.7 million as of June 30, 2019 and December 31, 2018, respectively.

Software Development Costs

Accretion of Redeemable Convertible Preferred Stock

Convertible Preferred Stock Warrant Liability

Leases

Concentrations of Credit Risks

Recently Adopted Accounting Pronouncements

Recently Issued Accounting Pronouncements

Description of Business and Basis of Presentation (Tables)

6 Months Ended

Jun. 30, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Schedule of Unaudited Pro forma Condensed Consolidated Balance Sheet

	Actual June 30, 2019			Pro Forma Adjustments			Pro Forma June 30, 2019
	(in thousands)
Assets
Total current assets	$	99,430		$	320,850		$	420,280
Total noncurrent assets		58,700			(5,307	)		53,393
Total assets	$	158,130		$	315,543		$	473,673
Liabilities, Redeemable Convertible Preferred Stock, Convertible Preferred Stock and Stockholders’ Equity (Deficit)
Total current liabilities	$	86,846		$	—		$	86,846
Total noncurrent liabilities		10,076			(2,710	)		7,366
Total liabilities		96,922			(2,710	)		94,212
Redeemable convertible preferred stock		198,228			(198,228	)		—
Convertible preferred stock		169,102			(169,102	)		—
Stockholder’s equity (deficit)
Common stock		1			1			2
Additional paid-in capital		1,729			685,582			687,311
Accumulated other comprehensive income		5			—			5
Accumulated deficit		(307,857	)		—			(307,857	)
Total stockholders’ equity (deficit)		(306,122	)		685,583			379,461
Total liabilities, redeemable convertible preferred stock, convertible preferred stock, and stockholders’ equity (deficit)	$	158,130		$	315,543		$	473,673

Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash that sum to the total of the same amounts shown in the statements of cash flows (in thousands):

	June 30, 2019		June 30, 2018
Cash and cash equivalents	$	53,314	$	91,216
Restricted cash		11,700		5,672
Total cash, cash equivalents and restricted cash	$	65,014	$	96,888

Cash, Cash Equivalents and Short Term Investments (Tables)

6 Months Ended

Jun. 30, 2019

Cash And Cash Equivalents [Abstract]

Summary of Estimated Value of Cash, Cash Equivalents and Short Term Investments

The following tables summarize the estimated value of the Company’s cash, cash equivalents and short-term investments (in thousands):

	June 30, 2019
	Amortized Cost		Unrealized Gain		Unrealized Loss		Fair Value
Cash and cash equivalents:
Cash	$	35,479	$	—	$	—	$	35,479
Money market fund		5,835		—		—	$	5,835
Reverse repurchase agreements		12,000		—		—		12,000
Total cash and cash equivalents	$	53,314	$	—	$	—	$	53,314
Short-term investments:
U.S. corporate bonds	$	9,172	$	4		—	$	9,176
International corporate bonds		4,195		1		—	$	4,196
Total short-term investments	$	13,367	$	5	$	—	$	13,372

	December 31, 2018
	Amortized Cost		Unrealized Gain		Unrealized Loss			Fair Value
Cash and cash equivalents:
Cash	$	10,253	$	—	$	—		$	10,253
Money market fund		140		—		—			140
Reverse repurchase agreements		24,000		—		—			24,000
Total cash and cash equivalents	$	34,393	$	—	$	—		$	34,393
Short-term investments:
U.S. corporate bonds	$	21,184	$	—	$	(19	)	$	21,165
International corporate bonds		5,972		—		(6	)		5,966
Total short-term investments	$	27,156	$	—	$	(25	)	$	27,131

Fair Value Measurement (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Schedule of Financial Instruments Measured at Fair Value

The following tables provide the financial instruments measured at fair value (in thousands):

	June 30, 2019
	Level 1		Level 2		Level 3		Total
Assets
Cash equivalents:
Money market fund	$	5,835	$	—	$	—	$	5,835
Reverse repurchase agreements		—		12,000		—	$	12,000
Total cash equivalents	$	5,835	$	12,000	$	—	$	17,835
Short-term investments:
U.S. corporate bonds	$	—	$	9,176	$	—	$	9,176
International corporate bonds		—		4,196		—	$	4,196
Total short-term investments	$	—	$	13,372	$	—	$	13,372
Total assets	$	5,835	$	25,372	$	—	$	31,207
Liabilities
Convertible preferred stock warrant liability	$	—	$	—	$	2,710	$	2,710
Total liabilities	$	—	$	—	$	2,710	$	2,710

	December 31, 2018
	Level 1		Level 2		Level 3		Total
Assets
Cash equivalents:
Money market fund	$	140	$	—	$	—	$	140
Reverse repurchase agreements		—		24,000		—		24,000
Total cash equivalents	$	140	$	24,000	$	—	$	24,140
Short-term investments:
U.S. corporate bonds	$	—	$	21,165	$	—	$	21,165
International corporate bonds		—		5,966		—		5,966
Total short-term investments	$	—	$	27,131	$	—	$	27,131
Total assets	$	140	$	51,131	$	—	$	51,271
Liabilities
Convertible preferred stock warrant liability	$	—	$	—	$	610	$	610
Total liabilities	$	—	$	—	$	610	$	610

Schedule of Fair Value of Level 3 Liabilities Recorded

The following table presents a rollforward of the fair value of the level 3 liabilities recorded at fair value at June 30, 2019 (in thousands):

	Convertible Preferred Stock Warrant Liability
Balance as of December 31, 2018	$	610
Changes in estimated fair value		2,100
Balance as of June 30, 2019	$	2,710

Balance Sheet Components (Tables)

6 Months Ended

Jun. 30, 2019

Balance Sheet Related Disclosures [Abstract]

Schedule of Property and Equipment, Net

Property and equipment, net consists of the following (in thousands):

	June 30, 2019			December 31, 2018
Proprietary software	$	17,939		$	14,052
Furniture and equipment		16,877			12,665
Automobiles		516			346
Leasehold improvements		30,515			25,702
		65,847			52,765
Less: accumulated depreciation and amortization		(25,420	)		(19,479	)
Property and equipment, net	$	40,427		$	33,286

Schedule of Other Accrued and Current Liabilities

Other accrued and current liabilities consist of the following (in thousands):

	June 30, 2019		December 31, 2018
Returns reserve	$	8,678	$	14,311
Accrued compensation		8,833		8,078
Site credit liability		5,921		4,700
Accrued sales tax and other taxes		3,170		4,476
Deferred revenue		3,943		3,184
Accrued marketing and outside services		6,558		4,152
Other		5,372		3,055
Other accrued and current liabilities	$	42,475	$	41,956

Convertible Preferred Stock and Redeemable Convertible Preferred Stock (Tables)

6 Months Ended

Jun. 30, 2019

Temporary Equity Disclosure [Abstract]

Summary of Convertible Preferred Stock and Redeemable Convertible Preferred Stock

Convertible preferred stock and redeemable convertible preferred stock consisted of the following (in thousands, except share amounts):

	June 30, 2019
	Shares Authorized		Shares Issued and Outstanding		Net Carrying Value		Aggregate Liquidation Preference
Series A		18,960,000		18,941,619	$	9,161	$	9,217
Series B		13,784,443		13,652,791		13,774		14,000
Series C		9,335,659		9,328,791		20,289		20,374
Series D		14,367,652		14,324,642		39,886		40,000
Series E		13,612,543		13,586,946		39,880		40,000
Series F		12,956,724		12,956,724		56,154		59,623
Series G		21,986,733		21,986,733		118,325		126,444
Series H		10,182,113		10,182,111		69,861		71,539
Total		115,185,867		114,960,357	$	367,330	$	381,197

	December 31, 2018
	Shares Authorized		Shares Issued and Outstanding		Net Carrying Value		Aggregate Liquidation Preference
Series A		18,960,000		18,941,619	$	9,161	$	9,217
Series B		13,784,443		13,652,791		13,774		14,000
Series C		9,335,659		9,328,791		20,289		20,374
Series D		14,367,652		14,324,642		39,886		40,000
Series E		13,612,543		13,586,946		39,880		40,000
Series F		12,956,724		12,956,724		54,968		57,211
Series G		21,986,733		21,986,733		116,242		120,544
Total		105,003,754		104,778,246	$	294,200	$	301,346

Share-based Compensation Plans (Tables)

6 Months Ended

Jun. 30, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Total Stock-based Compensation Expense, Excluding Compensation Expense Related to Stock Sales, by Function

Total stock-based compensation expense, excluding compensation expense related to stock sales by current and former employees, by function was as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Marketing	$	74	$	39	$	143	$	72
Operations and technology		476		263		966		536
Selling, general and administrative		737		379		1,288		618
Total	$	1,287	$	681	$	2,397	$	1,226

Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2019

Commitments And Contingencies Disclosure [Abstract]

Schedule of Future Minimum Lease Payments Under Noncancelable Operating Leases

As of June 30, 2019, the Company’s future minimum lease payments under the noncancelable leases are as follows (in thousands):

Year Ending December 31,	Operating Leases
2019	$	8,554
2020		17,753
2021		17,718
2022		14,941
2023		13,693
Thereafter		56,145
Total future minimum payments	$	128,804

Net Loss Per Share (Tables)

6 Months Ended

Jun. 30, 2019

Earnings Per Share [Abstract]

Schedule of Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted Net Loss Per Share

	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Numerator
Net loss attributable to common stockholders	$	(26,875	)	$	(18,937	)	$	(53,452	)	$	(34,152	)
Denominator
Weighted-average common shares outstanding used to calculate net loss per share attributable to common stockholders, basic and diluted		9,494,447			8,314,251			9,102,234			8,307,010
Net loss per share attributable to common stockholders, basic and diluted	$	(2.83	)	$	(2.28	)	$	(5.87	)	$	(4.11	)

Schedule of Anti-dilutive Securities Excluded from Computation of Diluted Net Loss Per Share

	June 30,
	2019		2018
Convertible preferred stock		38,778,180		35,916,225
Redeemable convertible preferred stock		19,585,426		16,410,256
Options to purchase common stock		9,537,699		8,703,564
Warrants to purchase convertible preferred stock		103,563		103,563
Warrant to purchase common stock		—		67,974
Total		68,004,868		61,201,582

Description of Business and Basis of Presentation - Additional Information (Details) $ / shares in Units, $ in Thousands		6 Months Ended
	Jul. 02, 2019 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) shares	Dec. 31, 2018 shares
Class Of Stock [Line Items]
Common stock, shares authorized		155,649,887	145,467,774
Offering expenses \| $		$ 3,057
Redeemable convertible preferred stock outstanding		114,960,357	104,778,246
Initial Public Offering
Class Of Stock [Line Items]
Number of common stock issued		17,250,000
Net proceeds from issuance of initial public offering \| $		$ 320,900
Offering expenses \| $		$ 5,300
Description of reverse stock split		On June 13, 2019 the Company effected a reverse split of shares of the Company’s common stock on a 1-for-2 basis
Reverse stock split ratio		0.5
Initial Public Offering \| The RealReal Foundation
Class Of Stock [Line Items]
Donation payable \| $		$ 3,200
Initial Public Offering \| Subsequent Event
Class Of Stock [Line Items]
Number of common stock issued	15,000,000
Common stock issued price per share \| $ / shares	$ 20.00
Net proceeds from issuance of initial public offering \| $	$ 320,900
Underwriting discounts and commissions \| $	$ 24,100
Common stock, shares authorized	500,000,000
Undesignated preferred stock, shares authorized for issuance	50,000,000
Redeemable convertible preferred stock outstanding	114,960,357
Convertible preferred stock converted into common stock	58,363,606
Initial Public Offering \| Subsequent Event \| Common Stock Warrants
Class Of Stock [Line Items]
Conversion of preferred stock warrants into common stock warrants	103,563
Underwriters’ Option to Purchase Additional Shares \| Subsequent Event
Class Of Stock [Line Items]
Number of common stock issued	2,250,000
Common stock issued price per share \| $ / shares	$ 20.00

Description of Business and Basis of Presentation - Schedule of Unaudited Pro forma Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Condensed Balance Sheet Statements Captions [Line Items]
Total current assets	$ 99,430		$ 89,146
Total noncurrent assets	58,700
Total assets	158,130		135,417
Total current liabilities	86,846		88,354
Other noncurrent liabilities	10,076		7,304
Total liabilities	96,922		98,907
Temporary equity	367,330		294,200
Stockholder’s equity (deficit)
Common stock	1
Additional paid-in capital	1,729
Accumulated other comprehensive income	5		(25)
Accumulated deficit	(307,857)		(257,665)
Total stockholders’ deficit	(306,122)	$ (280,979)	(257,690)	$ (210,213)	$ (191,611)	$ (176,986)
Total liabilities, redeemable convertible preferred stock, convertible preferred stock and stockholders’ deficit	158,130		135,417
Redeemable Convertible Preferred Stock
Condensed Balance Sheet Statements Captions [Line Items]
Temporary equity	198,228	198,308	151,381	144,910	51,476	50,367
Convertible Preferred Stock
Condensed Balance Sheet Statements Captions [Line Items]
Temporary equity	169,102	$ 169,098	$ 142,819	$ 133,192	$ 122,990	$ 122,990
Pro Forma Adjustments
Condensed Balance Sheet Statements Captions [Line Items]
Total current assets	320,850
Total noncurrent assets	(5,307)
Total assets	315,543
Other noncurrent liabilities	(2,710)
Total liabilities	(2,710)
Stockholder’s equity (deficit)
Common stock	1
Additional paid-in capital	685,582
Total stockholders’ deficit	685,583
Total liabilities, redeemable convertible preferred stock, convertible preferred stock and stockholders’ deficit	315,543
Pro Forma Adjustments \| Redeemable Convertible Preferred Stock
Condensed Balance Sheet Statements Captions [Line Items]
Temporary equity	(198,228)
Pro Forma Adjustments \| Convertible Preferred Stock
Condensed Balance Sheet Statements Captions [Line Items]
Temporary equity	(169,102)
Pro Forma
Condensed Balance Sheet Statements Captions [Line Items]
Total current assets	420,280
Total noncurrent assets	53,393
Total assets	473,673
Total current liabilities	86,846
Other noncurrent liabilities	7,366
Total liabilities	94,212
Stockholder’s equity (deficit)
Common stock	2
Additional paid-in capital	687,311
Accumulated other comprehensive income	5
Accumulated deficit	(307,857)
Total stockholders’ deficit	379,461
Total liabilities, redeemable convertible preferred stock, convertible preferred stock and stockholders’ deficit	$ 473,673

Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019 USD ($) Customer	Jun. 30, 2018 Customer	Jun. 30, 2019 USD ($) Customer	Jun. 30, 2018 Customer	Dec. 31, 2018 USD ($) Customer
Summary Of Significant Accounting Policies [Line Items]
Contractual liabilities	$ 3,943		$ 3,943		$ 3,184
Percentage of reverse repurchase agreement collateralized received	102.00%		102.00%
Letters of credit outstanding and collateral amount	$ 11,700		$ 11,700		11,200
Inventory reserve	$ 1,200		$ 1,200		$ 700
Accounts Receivable
Summary Of Significant Accounting Policies [Line Items]
Number of major customers \| Customer			0		0
Total Revenue
Summary Of Significant Accounting Policies [Line Items]
Number of major customers \| Customer	0	0	0	0
Maximum
Summary Of Significant Accounting Policies [Line Items]
Percentage of reverse repurchase agreement collateralized deposits	102.00%		102.00%
Deferred Revenue
Summary Of Significant Accounting Policies [Line Items]
Contractual liabilities	$ 3,300		$ 3,300		$ 2,700

Summary of Significant Accounting Policies - Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Cash and cash equivalents	$ 53,314	$ 34,393	$ 91,216
Restricted cash	11,700		5,672
Total cash, cash equivalents and restricted cash	$ 65,014	$ 45,627	$ 96,888	$ 20,660

Cash, Cash Equivalents and Short-Term Investments - Summary of Estimated Value of Cash, Cash Equivalents and Short-term Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Cash And Cash Equivalents [Line Items]
Cash and cash equivalents, amortized cost	$ 53,314	$ 34,393	$ 91,216
Cash and cash equivalents, fair value	53,314	34,393
Short-term investments, amortized cost	13,367	27,156
Short-term investments, unrealized gain	5
Short-term investments, unrealized loss		(25)
Short-term investments, fair value	13,372	27,131
Cash
Cash And Cash Equivalents [Line Items]
Cash and cash equivalents, amortized cost	35,479	10,253
Cash and cash equivalents, fair value	35,479	10,253
Money Market Fund
Cash And Cash Equivalents [Line Items]
Cash and cash equivalents, amortized cost	5,835	140
Cash and cash equivalents, fair value	5,835	140
Reverse Repurchase Agreements
Cash And Cash Equivalents [Line Items]
Cash and cash equivalents, amortized cost	12,000	24,000
Cash and cash equivalents, fair value	12,000	24,000
U.S. Corporate Bonds
Cash And Cash Equivalents [Line Items]
Short-term investments, amortized cost	9,172	21,184
Short-term investments, unrealized gain	4
Short-term investments, unrealized loss		(19)
Short-term investments, fair value	9,176	21,165
International Corporate Bonds
Cash And Cash Equivalents [Line Items]
Short-term investments, amortized cost	4,195	5,972
Short-term investments, unrealized gain	1
Short-term investments, unrealized loss		(6)
Short-term investments, fair value	$ 4,196	$ 5,966

Fair Value Measurement - Additional Information (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Asset transfers Level 1 to Level 2	$ 0	$ 0
Asset transfers Level 2 to Level 1	0	0
Asset transfers into Level 3	0	0
Asset transfers out of Level 3	0	0
Liabilities transfers Level 1 to Level 2	0	0
Liabilities transfers Level 2 to Level 1	0	0
Liability transfers into Level 3	0	0
Liability transfers out of Level 3	$ 0	$ 0

Fair Value Measurement - Schedule of Financial Instruments Measured at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets
Cash equivalents	$ 53,314	$ 34,393
Short-term investments	13,372	27,131
Recurring
Assets
Cash equivalents	17,835	24,140
Short-term investments	13,372	27,131
Total assets	31,207	51,271
Liabilities
Total liabilities	2,710	610
Recurring \| Money Market Fund
Assets
Cash equivalents	5,835	140
Recurring \| Reverse Repurchase Agreements
Assets
Cash equivalents	12,000	24,000
Recurring \| U.S. Corporate Bonds
Assets
Short-term investments	9,176	21,165
Recurring \| International Corporate Bonds
Assets
Short-term investments	4,196	5,966
Recurring \| Convertible Preferred Stock Warrant Liability
Liabilities
Total liabilities	2,710	610
Recurring \| Level 1
Assets
Cash equivalents	5,835	140
Total assets	5,835	140
Recurring \| Level 1 \| Money Market Fund
Assets
Cash equivalents	5,835	140
Recurring \| Level 2
Assets
Cash equivalents	12,000	24,000
Short-term investments	13,372	27,131
Total assets	25,372	51,131
Recurring \| Level 2 \| Reverse Repurchase Agreements
Assets
Cash equivalents	12,000	24,000
Recurring \| Level 2 \| U.S. Corporate Bonds
Assets
Short-term investments	9,176	21,165
Recurring \| Level 2 \| International Corporate Bonds
Assets
Short-term investments	4,196	5,966
Recurring \| Level 3
Liabilities
Total liabilities	2,710	610
Recurring \| Level 3 \| Convertible Preferred Stock Warrant Liability
Liabilities
Total liabilities	$ 2,710	$ 610

Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 65,847	$ 52,765
Less: accumulated depreciation and amortization	(25,420)	(19,479)
Property and equipment, net	40,427	33,286
Proprietary Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	17,939	14,052
Furniture And Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	16,877	12,665
Automobiles
Property Plant And Equipment [Line Items]
Property and equipment, gross	516	346
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 30,515	$ 25,702

Balance Sheet Components - Schedule of Other Accrued and Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Payables And Accruals [Abstract]
Returns reserve	$ 8,678	$ 14,311
Accrued compensation	8,833	8,078
Site credit liability	5,921	4,700
Accrued sales tax and other taxes	3,170	4,476
Deferred revenue	3,943	3,184
Accrued marketing and outside services	6,558	4,152
Other	5,372	3,055
Other accrued and current liabilities	$ 42,475	$ 41,956

Debt and Convertible Preferred Stock Warrants - Additional Information (Details) - USD ($)		1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 26, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2013
Debt Disclosure [Line Items]
Debt, success fee			$ 300,000
Interest expense related to term loans			$ 400,000	$ 100,000	$ 500,000	$ 300,000
Letter of Credit
Debt Disclosure [Line Items]
Deb maturity date							Aug. 01, 2019
Line of credit							$ 1,500,000
Series G Convertible Preferred Stock
Debt Disclosure [Line Items]
Debt, success fee		$ 100,000
Series B Convertible Preferred Stock
Debt Disclosure [Line Items]
Outstanding preferred stock warrants exercised (in shares)			131,652		131,652
Exercise price of warrants (in dollars per share)			$ 1.03		$ 1.03
Series C Convertible Preferred Stock
Debt Disclosure [Line Items]
Outstanding preferred stock warrants exercised (in shares)			6,868		6,868
Exercise price of warrants (in dollars per share)			$ 2.18		$ 2.18
Series D Convertible Preferred Stock
Debt Disclosure [Line Items]
Outstanding preferred stock warrants exercised (in shares)			43,010		43,010
Exercise price of warrants (in dollars per share)			$ 2.79		$ 2.79
Series E Convertible Preferred Stock
Debt Disclosure [Line Items]
Outstanding preferred stock warrants exercised (in shares)			25,597		25,597
Exercise price of warrants (in dollars per share)			$ 2.93		$ 2.93
Convertible Preferred Stock
Debt Disclosure [Line Items]
Warrant term					10 years
Term Loan Facility
Debt Disclosure [Line Items]
Maximum borrowing capacity									$ 5,000,000
Increase in borrowing capacity					$ 11,600,000
Debt instrument required covenants percentage on forecasted gross revenue					80.00%
Debt, combined success fee							$ 300,000
Debt, additional success fee						100,000
Net cash proceeds from subordinated debt securities						$ 50,000,000
Term Loans
Debt Disclosure [Line Items]
Long-term debt, gross								$ 15,000,000
Term Loans \| Subsequent Event
Debt Disclosure [Line Items]
Repayments on loans	$ 6,500,000
Term Loan I
Debt Disclosure [Line Items]
Long-term debt, gross								$ 7,500,000
Deb maturity date							Jan. 31, 2021	Jan. 31, 2019
Number of equal monthly installments					30 equal monthly installments
Variable annual interest rate							0.35%	0.10%
Term Loan II
Debt Disclosure [Line Items]
Long-term debt, gross								$ 7,500,000
Deb maturity date								Jan. 01, 2020

Convertible Notes - Additional Information (Details) - USD ($)	1 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2018	Apr. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Debt Instrument [Line Items]
Convertible notes issued to existing shareholders of redeemable convertible and convertible preferred stock		$ 14,400,000
Minimum threshold percentage on convertible notes to extend maturity date		80.00%
Conversion price per share	$ 4.7565			$ 4.7565		$ 4.7565
Convertible notes qualified financing		$ 25,000,000
Convertible notes non-qualified financing		$ 25,000,000
Interest expense			$ 400,000	$ 100,000	$ 500,000	$ 300,000
Principal and accrued interest on convertible notes	$ 14,600,000			14,600,000		14,600,000
Loss on extinguishment of convertible notes	$ 400,000					370,000
Series F Preferred Stock
Debt Instrument [Line Items]
Conversion price per share		$ 3.8590
Series G Redeemable Convertible Preferred Stock
Debt Instrument [Line Items]
Issuance of redeemable convertible preferred stock	1,067,550
Convertible Preferred Stock
Debt Instrument [Line Items]
Issuance of redeemable convertible preferred stock	1,997,709
Convertible Notes
Debt Instrument [Line Items]
Convertible notes annual interest rate		8.00%
Preferred stock issuance price percentage		90.00%
Liability recognized on estimated fair value of embedded derivative		$ 400,000
Debt issuance costs		$ 100,000
Interest expense				200,000		200,000
Convertible Notes \| Other Expense, Net
Debt Instrument [Line Items]
Change in fair value of convertible notes embedded derivative liability				$ 1,200,000		$ 1,200,000

Convertible Preferred Stock and Redeemable Convertible Preferred Stock - Summary of Convertible Preferred Stock and Redeemable Convertible Preferred Stock (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Temporary Equity [Line Items]
Shares Authorized	115,185,867	105,003,754
Shares Issued	114,960,357	104,778,246
Net Carrying Value	$ 367,330	$ 294,200
Aggregate Liquidation Preference	$ 381,197	$ 301,346
Shares Outstanding	114,960,357	104,778,246
Series A
Temporary Equity [Line Items]
Shares Authorized	18,960,000	18,960,000
Shares Issued	18,941,619	18,941,619
Net Carrying Value	$ 9,161	$ 9,161
Aggregate Liquidation Preference	$ 9,217	$ 9,217
Shares Outstanding	18,941,619	18,941,619
Series B
Temporary Equity [Line Items]
Shares Authorized	13,784,443	13,784,443
Shares Issued	13,652,791	13,652,791
Net Carrying Value	$ 13,774	$ 13,774
Aggregate Liquidation Preference	$ 14,000	$ 14,000
Shares Outstanding	13,652,791	13,652,791
Series C
Temporary Equity [Line Items]
Shares Authorized	9,335,659	9,335,659
Shares Issued	9,328,791	9,328,791
Net Carrying Value	$ 20,289	$ 20,289
Aggregate Liquidation Preference	$ 20,374	$ 20,374
Shares Outstanding	9,328,791	9,328,791
Series D
Temporary Equity [Line Items]
Shares Authorized	14,367,652	14,367,652
Shares Issued	14,324,642	14,324,642
Net Carrying Value	$ 39,886	$ 39,886
Aggregate Liquidation Preference	$ 40,000	$ 40,000
Shares Outstanding	14,324,642	14,324,642
Series E
Temporary Equity [Line Items]
Shares Authorized	13,612,543	13,612,543
Shares Issued	13,586,946	13,586,946
Net Carrying Value	$ 39,880	$ 39,880
Aggregate Liquidation Preference	$ 40,000	$ 40,000
Shares Outstanding	13,586,946	13,586,946
Series F Preferred Stock
Temporary Equity [Line Items]
Shares Authorized	12,956,724	12,956,724
Shares Issued	12,956,724	12,956,724
Net Carrying Value	$ 56,154	$ 54,968
Aggregate Liquidation Preference	$ 59,623	$ 57,211
Shares Outstanding	12,956,724	12,956,724
Series G
Temporary Equity [Line Items]
Shares Authorized	21,986,733	21,986,733
Shares Issued	21,986,733	21,986,733
Net Carrying Value	$ 118,325	$ 116,242
Aggregate Liquidation Preference	$ 126,444	$ 120,544
Shares Outstanding	21,986,733	21,986,733
Series H
Temporary Equity [Line Items]
Shares Authorized	10,182,113
Shares Issued	10,182,111
Net Carrying Value	$ 69,861
Aggregate Liquidation Preference	$ 71,539
Shares Outstanding	10,182,111

Share-based Compensation Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended			6 Months Ended		12 Months Ended
	Mar. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation expense		$ 1,287		$ 681	$ 2,397	$ 1,226
Selling, General and Administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation expense		$ 737	$ 800	$ 379	$ 1,288	$ 618
Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares issued in transaction	382,477
Sale of stock, price per share	$ 12.72		$ 12.72
Sale of stock, aggregate amount	$ 4,900
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized		1,750,000			1,750,000
Employee Stock Purchase Plan \| First Business Day
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options granted as percentage on fair value of stock					85.00%
Employee Stock Purchase Plan \| Last Business Day
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options granted as percentage on fair value of stock					85.00%
2011 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period							4 years
Percentage of maximum incentive stock options granted to stockholders							10.00%
2011 Plan \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options exercisable period							10 years
2011 Plan \| Incentive and Non-statutory Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized							12,987,255
2011 Plan \| Incentive and Non-statutory Stock Options \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options granted as percentage on fair value of stock							100.00%
2011 Plan \| Incentive Stock Options \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options granted as percentage on fair value of stock							110.00%
2019 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized		8,000,000			8,000,000

Share-based Compensation Plans - Schedule of Total Stock-based Compensation Expense, Excluding Compensation Expense Related to Stock Sales, by Function (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	$ 1,287		$ 681	$ 2,397	$ 1,226
Marketing
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	74		39	143	72
Operations and Technology
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	476		263	966	536
Selling, General and Administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	$ 737	$ 800	$ 379	$ 1,288	$ 618

Commitments and Contingencies - Additional Information (Details) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2018 USD ($) Installment	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)
Other Commitments [Line Items]
Operating lease rent expense		$ 4.6	$ 2.2	$ 8.7	$ 4.2
Outstanding liability		1.4		1.4
Selling, General and Administrative
Other Commitments [Line Items]
Estimated fair value of grant expense	$ 1.7
Fair value of grant, discount rate	10.00%
Endowment Agreement
Other Commitments [Line Items]
Donation fund	$ 2.0
Annual installment payment of donation fund	$ 0.5
Number of annual installments \| Installment	4
Other Accrued and Current Liabilities
Other Commitments [Line Items]
Deferred rent, current		0.9		0.9
Outstanding liability		1.0		1.0
Other Noncurrent Liabilities
Other Commitments [Line Items]
Deferred rent, noncurrent		6.0		6.0
Outstanding liability		$ 0.4		$ 0.4
Minimum [Member]
Other Commitments [Line Items]
Operating lease term		1 year		1 year
Maximum
Other Commitments [Line Items]
Operating lease term		11 years		11 years

Commitments and Contingencies - Schedule of Future Minimum Lease Payments Under Noncancelable Operating Leases (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Commitments And Contingencies Disclosure [Abstract]
2019	$ 8,554
2020	17,753
2021	17,718
2022	14,941
2023	13,693
Thereafter	56,145
Total future minimum payments	$ 128,804

Net Loss Per Share - Schedule of Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator
Net loss attributable to common stockholders	$ (26,875)	$ (18,937)	$ (53,452)	$ (34,152)
Denominator
Weighted-average common shares outstanding used to calculate net loss per share attributable to common stockholders, basic and diluted	9,494,447	8,314,251	9,102,234	8,307,010
Net loss per share attributable to common stockholders, basic and diluted	$ (2.83)	$ (2.28)	$ (5.87)	$ (4.11)

Net Loss Per Share - Schedule of Anti-dilutive Securities Excluded from Computation of Diluted Net Loss Per Share (Details) - shares	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share	68,004,868	61,201,582
Convertible Preferred Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share	38,778,180	35,916,225
Redeemable Convertible Preferred Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share	19,585,426	16,410,256
Options to Purchase Common Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share	9,537,699	8,703,564
Warrants \| Common Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share		67,974
Warrants \| Convertible Preferred Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net loss per share	103,563	103,563

Subsequent Events - Additional Information (Details) $ in Millions	Jul. 26, 2019 USD ($)
Subsequent Event \| Term Loans
Subsequent Event [Line Items]
Repayments on loans	$ 6.5

Fair Value Measurement - Schedule of Fair Value of Level 3 Liabilities Recorded (Details) - Convertible Preferred Stock Warrant Liability $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 610
Changes in estimated fair value	2,100
Ending balance	$ 2,710