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Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Cash flows from operating activities              
Net loss $ (6,336) $ (6,073) $ (4,967) $ (5,209) $ (12,409) $ (10,176)  
Adjustments to reconcile net loss to net cash used in operating activities:              
Depreciation and amortization         15 24  
Operating lease right of use asset amortization         98 125  
Financing lease right of use asset amortization 211   250   422 501  
Stock-based compensation 1,741   1,278   3,147 2,287  
Net accretion of discounts on available-for-sale securities         (202) (6)  
Loss on asset disposal         2 0  
Changes in operating assets and liabilities:              
Accounts receivable         0 6  
Interest receivable         72 10  
Prepaid and other current assets         (163) (358)  
Accounts payable         (39) 173  
Accrued expenses         129 (32)  
Accrued payroll expenses         468 (679)  
Operating lease liability         (37) (158)  
Deferred revenue         (7) (4)  
Net cash used in operating activities         (8,504) (8,287)  
Cash flows from investing activities              
Acquisition of property and equipment         (16) (14)  
Purchase of available-for-sale securities         (26,988) 0  
Maturity of available-for-sale securities         3,890 1,000  
Net cash provided by/(used in) investing activities         (23,114) 986  
Cash flows from financing activities              
Proceeds from registered direct offering of common stock net of commissions and expenses         23,596 0  
Proceeds from at-the-market sale of stock, net of commissions and expenses         3,098 3,199  
Proceeds from exercise of stock options         1,280 905  
Payments on principal of financing lease         (420) (555)  
Net cash provided by financing activities         27,554 3,549  
Net (decrease) in cash and cash equivalents         (4,064) (3,752)  
Cash and cash equivalents at beginning of period   $ 19,210   $ 25,778 19,210 25,778 $ 25,778
Cash and cash equivalents at end of period $ 15,146   $ 22,026   15,146 22,026 $ 19,210
Supplemental information:              
Cash paid for interest         4 39  
Cash paid for taxes         $ 0 $ 0