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Condensed Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities    
Net loss $ (10,565) $ (12,208)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 237 165
Operating Lease, Right-of-Use Asset, Amortization Expense 128 111
Stock-based compensation 1,304 1,222
Non-cash interest expense 0 2
Other (184) 36
Changes in operating assets and liabilities:    
Accounts receivable (7) (12)
Other receivables 6,000 3,116
Prepaid expenses and other assets 118 209
Accounts payable (5) (252)
Accrued and other current liabilities (1,893) (1,942)
Deferred revenue (14) (4)
Net cash used in operating activities (4,881) (9,557)
Cash flows from investing activities    
Purchases of marketable securities (14,735) (6,614)
Proceeds from maturities and sales of marketable securities 17,094 21,252
Purchases of property and equipment (39) (7)
Proceeds from disposal of property and equipment 0 3
Net cash provided by investing activities 2,320 14,634
Cash flows from financing activities    
Proceeds from exercise of stock options 4 89
Finance lease principal payments (120) (18)
Net cash (used in) provided by financing activities (116) 71
Net (decrease) increase in cash and cash equivalents (2,677) 5,148
Cash and cash equivalents at beginning of period 29,878 58,932
Cash and cash equivalents at end of period 27,201 64,080
Supplemental disclosure of cash flow information    
Cash paid for interest 16 2
Supplemental disclosure of non-cash investing and financing information    
Purchases of property and equipment in accounts payable and accruals $ 47 $ 0