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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Cash Flows From Operating Activities:    
Net loss $ (6,592) $ (14,366)
Adjustments required to reconcile net loss to net cash used in operating activities:    
Depreciation 12 12
Stock-based compensation 910 1,292
Amortization of premium or discount on marketable securities (21) (538)
Changes in operating assets and liabilities:    
Prepaid expenses and other assets and operating lease right-of-use assets 462 306
Trade payables, accrued expenses, employee related obligations and other long-term liabilities (844) (8,896)
Operating lease liabilities 0 (74)
Net cash used in operating activities (6,073) (22,264)
Cash Flows From Investing Activities:    
Proceeds from sale and maturity of marketable securities 5,000 47,850
Purchases of marketable securities 0 (23,344)
Net cash provided by investing activities 5,000 24,506
Cash Flows From Financing Activities:    
Withholdings from exercise of options and issuance of shares for stock-based compensation arrangements, net (29) (121)
Net cash used in financing activities (29) (121)
(Decrease) increase in cash and cash equivalents (1,102) 2,121
Cash and cash equivalents at beginning of the period 24,027 19,926
Cash and cash equivalents at end of the period 22,925 22,047
Supplementary information on investing and financing activities not involving cash flows:    
Issuance of vested shares under employee stock purchase plan 10 13
Cashless exercise of pre-funded warrants $ 0 $ 1