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Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES    
Net Loss $ (19,790) $ (17,441)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 77 77
Operating lease right of use asset amortization 216 200
Financing lease right of use asset amortization 1,146 1,229
Stock-based compensation 4,013 3,367
Accretion of discounts on available-for-sales securities (254) 0
Gain on sale of assets (3) 0
Changes in operating assets and liabilities:    
Unbilled contracts receivable (550) 0
Interest receivable (31) 0
Prepaid expenses and other current assets 174 (108)
Accounts payable 221 59
Accrued expenses 49 (30)
Accrued payroll expenses 415 366
Operating lease liability (240) (218)
Net cash used in operating activities (14,557) (12,499)
CASH FROM INVESTING ACTIVITIES    
Acquisition of property and equipment (31) (39)
Proceeds from sale of property and equipment 15 0
Purchase of available-for-sale securities (19,539) 0
Maturity of available-for-sale securities 12,804 0
Net cash used in investing activities (6,751) (39)
CASH FLOWS FROM FINANCING ACTIVITIES    
Proceeds from at-the-market sale of stock, net of commissions and expenses 13,505 5,763
Proceeds from exercise of stock options 128 244
Payments of principal for financing lease (918) (984)
Net cash provided by financing activities 12,715 5,023
Net decrease in cash and cash equivalents (8,593) (7,515)
Cash and cash equivalents at beginning of year 21,184 28,699
Cash and cash equivalents at end of year 12,591 21,184
Supplemental information:    
Cash paid for interest 194 255
Cash paid for taxes $ 0 $ 0