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CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Operating activities    
Net loss $ (10,011) $ (11,223)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 102 90
Stock-based compensation expense 1,124 1,064
Accretion of discounts on short-term investments, net (156) (163)
Changes in operating assets and liabilities:    
Other assets 4 26
Accounts receivable and unbilled receivable (105) 95
Prepaid expenses and other current assets (95) 1,251
Operating lease right-of-use assets 134 136
Accounts payable and accrued liabilities 1,415 203
Operating lease liabilities (152) (138)
Net cash used in operating activities (7,740) (8,659)
Investing activities:    
Capital expenditures (80) (8)
Maturities of short-term investments 5,635 42,983
Purchases of short-term investments (919) (37,327)
Sales of short-term investments 0 1,681
Net cash provided by investing activities 4,636 7,329
Financing activities:    
Proceeds from exercise of options 107 0
Net cash provided by financing activities 107 0
Net change in cash and cash equivalents (2,997) (1,330)
Cash and cash equivalents—Beginning of period 21,655 16,347
Cash and cash equivalents—End of period 18,658 15,017
Supplemental disclosure of non-cash investing and financing activities:    
Acquisition of property and equipment included in accounts payable and accrued expenses $ 0 $ 133