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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities:    
Net loss $ (1,490) $ (2,021)
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 7 9
Share based compensation 80 620
Depreciation and amortization 36 46
Gain from sale of fixed assets (23)  
Reserve for prepaid materials   96
Change in operating assets and liabilities:    
Contract assets (205) (247)
Accounts receivable 6 (124)
Prepaid expenses and other assets (56) 127
Accounts payable and accrued liabilities 57 2
Accrued compensation and related taxes 85 25
Contract liabilities   (46)
Net cash used in operating activities (1,503) (1,513)
Cash flows from investing activities:    
Acquisition of fixed assets (5) (54)
Disbursements for patents and other intangible assets (33) (34)
Proceeds from sale of fixed assets 23  
Net cash used in investing activities (15) (88)
Cash flows from financing activities:    
Proceeds from issuance of common stock, net of offering costs 578 3,393
Proceeds from exercise of stock options and warrants   109
Net cash provided by financing activities 578 3,502
Net change in cash and cash equivalents (940) 1,901
Cash and cash equivalents, beginning of period 7,607 8,824
Cash and cash equivalents, end of period 6,667 10,725
Supplemental disclosure of cash flow information:    
Officer and employee equity awards for prior year accrued compensation $ 107 $ 217