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Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Operating activities    
Net loss $ (45,851) $ (45,431)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 364 404
Stock-based compensation expense 5,693 4,760
Amortization of right-of-use assets 540 539
Accretion of discounts on short-term investments, net (848) (598)
Changes in operating assets and liabilities:    
Accounts receivable and unbilled receivable 591 (484)
Prepaid expenses and other current assets 557 (452)
Other assets (480) 1,210
Accounts payable and accrued liabilities 2,202 2,985
Operating lease liabilities (691) (626)
Net cash used in operating activities (37,923) (37,693)
Investing activities:    
Capital expenditures (44) (80)
Maturities of short-term investments 71,111 27,106
Purchases of short-term investments (71,860) (23,563)
Sales of short-term investments 2,135 10,265
Net cash provided by investing activities 1,342 13,728
Financing activities:    
Proceeds from sales of common stock, net of expenses of $0 and $3,286, respectively 0 53,407
Proceeds from exercise of warrants, net of expense of $169 and $0, respectively 2,088 0
Proceeds from exercise of options 493 373
Net cash provided by financing activities 2,581 53,780
Net change in cash and cash equivalents (34,000) 29,815
Cash and cash equivalents - Beginning of year 51,470 21,655
Cash and cash equivalents - End of year 17,470 51,470
Supplemental disclosure of non-cash investing activities:    
Cash paid for taxes 1 1
Purchases of unsettled short-term investments included in accrued liabilities $ 744 $ 0