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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities:    
Net (loss) income $ (14,047) $ 88,384
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities    
Depreciation and amortization 0 304
Stock-based compensation expense 1,464 1,435
Accretion of investment discount (621) 100
Amortization of debt issuance costs and discount 822 2,256
Change in fair value of warrant liabilities (3,848) 13,459
Change in fair value of derivative liabilities (196) 364
Noncash operating lease expense for right-of-use asset 131 110
Write off of deferred asset for commitment fees 0 514
Prepayment fee for loan payable payment   263
Changes in operating assets and liabilities:    
Prepaid expenses, other assets, deferred costs, and other 4,131 (165)
License agreement receivable 2,230 (25,000)
License agreement contract asset (146) (19,249)
Accounts receivable 0 (243)
Inventory 0 (4,563)
Accounts payable (1,759) (2,521)
Accrued expenses (1,997) 1,562
Deferred revenue (870) 4,369
Other liabilities and other (161) (5,904)
Net cash (used in) provided by operating activities (14,867) 55,475
Cash flows from investing activities:    
Purchase of investments (10,719) (26,941)
Maturity of investments 17,545 20,557
Net cash provided by (used in) investing activities 6,826 (6,384)
Cash flows from financing activities:    
Proceeds from common stock issued   4
Payments of deferred offering costs (40) 0
Payments of loan payable   (36,383)
Payment of loan payable prepayment fee   (263)
Proceeds from employee stock purchase plan issuances 25 4
Repurchase of shares to satisfy tax withholdings 0 18
Net cash used in by financing activities (15) (36,620)
Net (decrease) increase in cash, cash equivalents, and restricted cash (8,056) 12,471
Cash, cash equivalents, and restricted cash at beginning of period 34,593 46,032
Cash, cash equivalents, and restricted cash at end of period 26,537 58,503
Supplemental cash flow information:    
Cash paid for interest 420 2,828
Cash received for interest $ 1,721 $ 1,434