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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Operating Activities    
Net loss $ (12,612) $ (12,717)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 17 992
Depreciation and amortization 110 197
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 274 650
Operating lease right-of-use asset 278 236
Accounts payable, accrued compensation and other liabilities (1,315) (1,805)
Long-term operating lease liability (420) (357)
Net cash used in operating activities (13,668) (12,804)
Financing Activities    
Value of equity awards withheld for tax liability   (1)
Proceeds from issuance of common stock and pre-funded warrants exercise, net of issuance costs 14,364 3,970
Payments in lieu of fractional shares   (3)
Net cash used in financing activities 14,364 3,966
Decrease in cash and cash equivalents 696 (8,838)
Cash and cash equivalents at beginning of period 8,714 16,904
Cash and cash equivalents at end of period 9,410 $ 8,066
Supplemental Cash Flow Information    
Warrant modification - incremental value $ 586