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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities:    
Net loss $ (1,108) $ (1,429)
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 3 3
Share-based compensation 67 242
Reserve for share-based compensation tax withholdings (16)  
Depreciation and amortization 45 80
Gain from sale of fixed assets   (5)
Right of use asset amortization 22 43
Realized gain from marketable securities   (20)
Lease Amendments   (14)
Change in operating assets and liabilities:    
Contract assets 188 16
Accounts receivable (282) 29
Prepaid expenses and other assets 1 51
Accounts payable and accrued liabilities 253 57
Accrued compensation and related taxes (96) 1
Contract liabilities (78) 392
Net cash used in operating activities (1,001) (554)
Cash flows from investing activities:    
Disbursements for patents and other intangible assets (34) (24)
Proceeds from sale of fixed assets   5
Purchases of held-to-maturity short-term U.S. treasuries   (2,162)
Redemption of held-to-maturity short-term U.S. treasuries   1,627
Net cash used in investing activities (34) (554)
Cash flows from financing activities:    
Taxes paid related to vesting of restricted stock units (22) (15)
Net cash used in financing activities (22) (15)
Effect of exchange rate changes on cash and cash equivalents (3)  
Net change in cash and cash equivalents (1,060) (1,123)
Cash and cash equivalents, beginning of period 5,684 6,451
Cash and cash equivalents, end of period 4,624 5,328
Supplemental disclosure of cash flow information:    
Officer and employee equity awards for prior year accrued compensation $ 326 234
Prior year prepaid expenses repurposed to fixed assets as demonstration equipment   $ 209