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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Operating Activities    
Net loss $ (26,723) $ (35,593)
Adjustment to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 395 626
Stock-based compensation 8,740 10,548
Accretion of unamortized debt discount and amortization of debt issuance costs 410 837
Amortization of premium for marketable securities 0 53
Change in fair value of common stock warrant liabilities (9) 1
Changes in operating assets and liabilities:    
Accounts receivable, net 846 (2,367)
Prepaid expenses and other assets 795 (3,276)
Accounts payable 9,659 2,986
Loss contingency accrual 0 151
Operating lease liabilities (430) (545)
Other accruals and liabilities 1,921 11,880
Net cash used in operating activities (4,396) (14,699)
Investing Activities    
Purchases of property and equipment, including internal-use software (515) (11,608)
Purchases of marketable securities (4) 0
Proceeds from sales of marketable securities 688 41,729
Proceeds from maturities of marketable securities 0 37,640
Net cash provided by investing activities 169 67,761
Financing Activities    
Principal payments on finance leases obligations (244) (282)
Repurchase of common stock (6,956) 0
Proceeds from exercise of common stock warrants, net of redemptions 0 33
Net cash used in financing activities (7,200) (249)
Net change in cash, cash equivalents and restricted cash (11,427) 52,813
Cash, cash equivalents and restricted cash – beginning of year 312,028 365,436
Cash, cash equivalents and restricted cash – end of period 300,601 418,249
Cash paid during the period for:    
Interest 33 63
Income Taxes Paid $ 0 $ 0