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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 $ (122,461) $ (23,605) $ (27,780)
Adjustment to reconcile net loss to net cash used in operating activities:      
Depreciation and amortization 1,609 711 404
Stock-based compensation 23,757 1,237 6,680
Accretion of unamortized discount and amortization of issuance costs 558 2,139 1,287
Fair value adjustment of derivatives 21,463 (3,649) 45
Impairment charges 3,573    
Changes in operating assets and liabilities:      
Prepaid expenses and other assets (7,505) (4,307) (992)
Accounts payable 10,729 (54) 1,851
Other liabilities 12,045 5,591 1,557
Net cash used in operating activities (56,232) (21,937) (16,948)
Investing Activities      
Purchases of property and equipment, including internal-use software (3,246) (3,223) (867)
Net cash used in investing activities (3,246) (3,223) (867)
Financing Activities      
Borrowings under debt agreements, net of issuance costs   9,563 19,920
Payments for issuance costs (201)    
Payments under debt agreements (10,000) (3,500) (5,000)
Net cash Business Combination and private placement financing 246,484    
Payments made toward offering costs (1,993)    
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs 76,617 24,908 18,218
Proceeds from exercise of stock options and issuance of common stock 1,243 197 192
Proceeds from exercise of common stock warrants 382    
Taxes paid related to net share settlement of equity awards (13,404)    
Payments made to repurchase common stock (1,339)    
Payments for redemption of preferred stock (1,211)    
Net cash provided by financing activities 296,578 31,168 33,330
Net change in cash, cash equivalents and restricted cash 237,100 6,008 15,515
Cash, cash equivalents and restricted cash - beginning of year 28,548 22,540 7,025
Cash, cash equivalents and restricted cash - end of year 265,648 28,548 22,540
Cash paid during the period for:      
Interest 815 269 $ 196
Noncash investing and financing activities:      
Carrying value of long-term debt and accrued interest converted to redeemable convertible preferred stock   $ 14,852  
Settlement of the Redeemable Convertible Series E preferred stock forward contract liability 21,688    
Deferred offering costs in accounts payable and accrued liabilities 14,065    
Payment of promissory notes through surrender of shares $ 18,673