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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Cash flows from operating activities:    
Consolidated net loss $ (10,792) $ (14,881)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 162 167
Stock-based compensation 1,307 1,178
Accretion of discount of available-for-sale investment securities (255) (523)
Amortization of right-of-use assets 232 216
Changes in operating assets and liabilities:    
Other receivables 396 748
Prepaid expenses and other assets 91 2,159
Accounts payable and accrued expenses (3,467) (4,322)
Operating lease liability (191) (162)
Net cash used in operating activities (12,517) (15,420)
Cash flows from investing activities:    
Purchases of property and equipment (138) 0
Purchases of available-for-sale investment securities (5,868) (23,105)
Maturities of available-for-sale investment securities 17,500 18,685
Net cash provided by (used in) investing activities 11,494 (4,420)
Cash flows from financing activities:    
Proceeds from issuance of common stock through option exercises 0 2
Proceeds from issuance of common stock from at-the-market offerings, net of offering costs 0 18,757
Principal paid on finance lease liabilities (142) (131)
Net cash (used in) provided by financing activities (142) 18,628
Net change in cash, cash equivalents and restricted cash (1,165) (1,212)
Cash, cash equivalents and restricted cash at beginning of period 12,978 14,006
Cash, cash equivalents and restricted cash at the end of period 11,813 12,794
Cash and cash equivalents at the end of period 10,008 10,362
Restricted cash at the end of period 1,805 2,432
Cash, cash equivalents and restricted cash at the end of period 11,813 12,794
Supplemental disclosure of cash flow information:    
Interest paid 17 28
Purchases of property and equipment in accounts payable $ 15 $ 17