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Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Operating activities    
Net loss $ (8,562) $ (7,525)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 239 243
Non-cash stock-based compensation 1,240 859
Amortization of financing lease right-of-use assets 204 188
Amortization of operating lease right-of-use assets 189 159
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 603 510
Other non-current assets (65) 0
Accounts payable 489 (1,035)
Accrued expenses and other current liabilities (2,060) (667)
Short-term operating lease liabilities 37 25
Long-term operating lease liabilities (233) (196)
Net cash used in operating activities (7,919) (7,439)
Investing activities    
Purchases of property and equipment (50) (371)
Construction in progress (21) (58)
Net cash used in investing activities (71) (429)
Financing activities    
Payment of issuance costs (89) 0
Proceeds from the issuance of common stock, net of issuance costs 0 722
Principal payments on financing leases (188) (175)
Net cash (used in) provided by financing activities (277) 547
Net decrease in cash and restricted cash (8,267) (7,321)
Cash and restricted cash at beginning of period 21,538 18,434
Cash and restricted cash at end of period 13,271 11,113
Cash, end of period 13,015 10,860
Restricted cash, end of period 256 253
Cash and restricted cash, end of period 13,271 11,113
Supplemental disclosure of non-cash operating, financing and investing information    
Initial measurement of operating lease right-of-use assets and liabilities 714 0
Lease modification of operating lease right-of-use assets and liabilities $ 492 $ 0