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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating activities      
Net loss $ (202,799) $ (142,978) $ (85,178)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 4,654 6,157 6,932
Amortization of debt issuance costs 938 357 279
Loss on extinguishment of debt   1,031  
Stock-based compensation expense 13,254 2,756 1,158
Loss on disposal of property and equipment 46 789 3,198
Provision for inventory obsolescence 6,588 2,682 (1,069)
Revaluation of preferred stock warrant 20,470 769 174
Other 2,329 789  
Changes in operating assets and liabilities:      
Accounts receivable (32,068) (18,430) 9,049
Inventory (224,489) (92,877) 11,902
Prepaid expenses and other current assets (9,117) (3,935) (2,916)
Other assets (4,556) (3,487) (3,105)
Accounts payable 14,066 4,035 (6,527)
Accrued expenses 28,431 10,131 6,291
Deferred revenue 7,499 10,902 860
Other liabilities 19,500 5,673 (5,959)
Net cash used in operating activities (355,254) (215,636) (64,911)
Investing activities      
Purchase of property and equipment (11,329) (3,528) (2,062)
Proceeds from the sale of property and equipment     14,850
Net cash (used in) provided by investing activities (11,329) (3,528) 12,788
Financing activities      
Repayments of long-term debt   (25,000) (5,506)
Payments of debt extinguishment costs   (685)  
Proceeds from vehicle floorplan 1,242,736 992,179 648,309
Repayments of vehicle floorplan (1,086,966) (914,200) (656,194)
Payment of vehicle floorplan upfront commitment fees (2,906)    
Proceeds from the issuance of redeemable convertible preferred stock, net 21,694 227,502 145,899
Repurchase of common stock (1,818) (5,824)  
Common stock shares withheld to satisfy employee tax withholding obligations (2,915)    
Proceeds from the issuance of common stock in connection with IPO, net of underwriting discount 504,024    
Payments of costs related to IPO (6,791) (723)  
Proceeds from the issuance of common stock in connection with follow-on public offering, net of underwriting discount 569,471    
Payments of costs related to follow-on public offering (1,519)    
Proceeds from exercise of stock options 2,341 1,810 31
Other financing activities (316) 183 (164)
Net cash provided by financing activities 1,237,035 275,242 132,375
Net increase in cash, cash equivalents and restricted cash 870,452 56,078 80,252
Cash, cash equivalents and restricted cash at the beginning of period 219,587 163,509 83,257
Cash, cash equivalents and restricted cash at the end of period 1,090,039 219,587 163,509
Supplemental disclosure of cash flow information:      
Cash paid for interest 8,540 12,607 7,743
Cash paid for income taxes 163 157 212
Supplemental disclosure of non-cash investing and financing activities:      
Accretion of redeemable convertible preferred stock   132,750 $ 13,036
Series H preferred stock issuance costs included in accrued expenses   5,020  
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 $ 97 200  
IPO      
Supplemental disclosure of non-cash investing and financing activities:      
Costs related to IPO included in accrued expenses and accounts payable   $ 1,703