CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating activities
Net loss	$ (104,287)	$ (60,479)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	2,059	3,146
Amortization of debt issuance costs	375	179
Stock-based compensation expense	4,700	1,536
Loss on disposal of property and equipment		764
Provision for inventory obsolescence	(1,564)	1,889
Revaluation of preferred stock warrant	20,470	142
Other	632
Changes in operating assets and liabilities:
Accounts receivable	14,863	(14,544)
Inventory	66,247	(76,209)
Prepaid expenses and other current assets	(7,909)	(1,814)
Other assets	(1,285)	(1,488)
Accounts payable	919	6,501
Accrued expenses	4,714	7,224
Deferred revenue	(1,835)	2,664
Other liabilities	1,905	2,592
Net cash (used in) provided by operating activities	4	(127,897)
Investing activities
Purchase of property and equipment	(3,128)	(794)
Net cash used in investing activities	(3,128)	(794)
Financing activities
Repayments of long-term debt		(3,340)
Proceeds from vehicle floorplan	465,663	420,518
Repayments of vehicle floorplan	(529,341)	(349,545)
Payment of vehicle floorplan upfront commitment fees	(1,125)
Proceeds from the issuance of redeemable convertible preferred stock, net	21,694
Repurchase of common stock	(1,818)	(542)
Common stock shares withheld to satisfy employee tax withholding obligations	(878)
Proceeds from the issuance of common stock in connection with IPO, net of underwriting discount	504,023
Payments of costs related to IPO	(1,740)
Proceeds from exercise of stock options	13	347
Other financing activities	(66)	268
Net cash provided by financing activities	456,425	67,706
Net (decrease) increase in cash, cash equivalents and restricted cash	453,301	(60,985)
Cash, cash equivalents and restricted cash at the beginning of period	219,587	163,509
Cash, cash equivalents and restricted cash at the end of period	672,888	102,524
Supplemental disclosure of cash flow information:
Cash paid for interest	2,743	5,176
Cash paid for income taxes		209
Supplemental disclosure of non-cash investing and financing activities:
Accretion of redeemable convertible preferred stock		43,843
Conversion of redeemable convertible preferred stock warrant to common stock warrant	21,873
Issuance of common stock as upfront payment to nonemployee	2,127
Accrued property and equipment expenditures	611	$ 101
IPO
Supplemental disclosure of non-cash investing and financing activities:
Costs related to IPO included in accrued expenses and accounts payable	$ 5,051