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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Cash flows from operating activities:    
Net loss $ (3,128) $ (4,312)
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 14 18
Share based compensation 130 691
Depreciation and amortization 72 92
Estimated losses on contracts   574
Gain from sale of fixed assets (37)  
Gain on forgiveness of Payroll Protection Program Loan and interest   (251)
Change in operating assets and liabilities:    
Contract assets (448) (590)
Accounts receivable 33  
Prepaid expenses and other assets (260) (81)
Accounts payable and accrued liabilities 102 6
Accrued compensation and related taxes 175 225
Contract liabilities   (46)
Net cash used in operating activities (3,347) (3,674)
Cash flows from investing activities:    
Acquisition of fixed assets (5) (25)
Disbursements for patents and other intangible assets (73) (69)
Proceeds from sale of fixed assets 37  
Net cash used in investing activities (41) (94)
Cash flows from financing activities:    
Proceeds from issuance of common stock, net of offering costs 4,798 5,309
Proceeds from exercise of stock options and warrants   277
Net cash provided by financing activities 4,798 5,586
Effect of exchange rate changes on cash and cash equivalents (10)  
Net change in cash and cash equivalents 1,400 1,818
Cash and cash equivalents, beginning of period 7,607 8,824
Cash and cash equivalents, end of period 9,007 10,642
Supplemental disclosure of cash flow information:    
Officer and employee equity awards for prior year accrued compensation $ 107 $ 217