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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Cash flows from operating activities:    
Net (loss) income $ (1,808) $ 825
Adjustments to reconcile net (loss) income to net cash used in operating activities:    
Depreciation and amortization 59
Amortization of operating lease right-of-use asset 215
Stock-based compensation 8 198
Fair value adjustment of warrants (66)
Changes in operating assets and liabilities:    
Accounts receivable (16) 358
Prepaid expenses and other current assets 82 30
Other long-term assets 13 41
Accounts payable (152) (1,194)
Accrued expenses and other current liabilities 126 875
Operating lease liability (144)
Deferred revenue (3,982)
Net cash used in operating activities (1,813) (2,719)
Cash flows from investing activities:    
Purchases of property and equipment (154)
Net cash used in investing activities (154)
Net decrease in cash, cash equivalents and restricted cash (1,813) (2,873)
Cash, cash equivalents and restricted cash — beginning of period 9,531 20,645
Total cash, cash equivalents and restricted cash 7,718 17,772
Reconciliation of cash, cash equivalents and restricted cash to the consolidated balance sheets:    
Cash and cash equivalents 7,708 16,300
Long-term restricted cash 10 1,472
Supplemental disclosures of non-cash investing and financing information:    
Purchases of property and equipment not yet paid $ 244