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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities:    
Net loss $ (1,429) $ (1,490)
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 3 7
Share-based compensation 242 80
Depreciation and amortization 80 36
Gain from sale of fixed assts (5) (23)
Right of use asset amortization 43 35
Realized gain from market securities (20)  
Lease amendments (14)  
Change in operating assets and liabilities:    
Contract assets 16 (205)
Accounts receivable 29 6
Prepaid expenses and other assets 51 (56)
Accounts payable and accrued liabilities 57 22
Accrued compensation and related taxes 1 85
Contract liabilities 392  
Net cash used in operating activities (554) (1,503)
Cash flows from investing activities:    
Acquisition of fixed assets   (5)
Disbursements for patents and other intangible assets (24) (33)
Proceeds from sale of fixed assets 5 23
Purchases of held-to-maturity short-term US treasuries (2,162)  
Redemption of held-to-maturity US treasuries 1,627  
Net cash used in investing activities (554) (15)
Cash flows from financing activities:    
Proceeds from issuance of common stock, net of offering costs   578
Taxes paid related to vesting of restricted stock units (15)  
Net cash (used in) provided by financing activities (15) 578
Net change in cash and cash equivalents (1,123) (940)
Cash and cash equivalents, beginning of period 6,451 7,607
Cash and cash equivalents, end of period 5,328 6,667
Supplemental disclosure of cash flow information:    
Officer and employee equity awards for prior year accrued compensation 234 $ 107
Prior year prepaid expenses repurposed to fixed assets as demonstration equipment $ 209