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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities:    
Net income (loss) $ 411 $ (33,876)
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Depreciation and amortization 0 151
Stock-based compensation expense 705 707
Accretion of investment discount (253) (219)
Amortization of debt issuance costs and discount 401 255
Change in fair value of warrant liabilities (9,608) 21,673
Change in fair value of derivative liabilities (168) 406
Noncash operating lease expense for right-of-use asset 64 54
Write off of deferred asset for commitment fees 0 514
Changes in operating assets and liabilities:    
Prepaid expenses, other assets, deferred costs, and other 3,966 778
License agreement receivable 2,463 0
License agreement contract asset (103) 0
Accounts receivable 0 41
Inventory 0 (2,706)
Accounts payable 1,809 (12)
Accrued expenses (2,893) (853)
Deferred revenue (722) 0
Other liabilities and other (79) (5,836)
Net cash used in operating activities (4,007) (18,923)
Cash flows from investing activities:    
Purchase of investments (2,510) 0
Maturity of investments 7,964 0
Net cash provided by investing activities 5,454 0
Cash flows from financing activities:    
Payments of deferred offering costs (40) 0
Proceeds from employee stock purchase plan issuances 25 4
Repurchase of shares to satisfy tax withholdings 0 18
Net cash (used in) provided by financing activities (15) 22
Net increase (decrease) in cash, cash equivalents, and restricted cash 1,432 (18,901)
Cash, cash equivalents, and restricted cash at beginning of period 34,593 46,032
Cash, cash equivalents, and restricted cash at end of period 36,025 27,131
Supplemental cash flow information:    
Cash paid for interest 420 1,658
Cash received for interest $ 1,041 $ 373