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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Cash Flows from operating activities:    
Net loss $ (7,892) $ (6,886)
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 33 17
Share based compensation 680 800
Depreciation and amortization 260 210
Abandonment and impairment 484  
Gain on forgiveness of Payroll Protection Program Loan and interest (251)  
Change in operating assets and liabilities:    
Contract assets 53 (53)
Accounts receivable (33)  
Prepaid expenses and other assets 121 (75)
Accounts payable and accrued liabilities (205) (382)
Accrued compensation and related taxes 53 361
Contract liabilities (10) 44
Net cash used in operating activities (6,707) (5,964)
Cash Flows from investing activities:    
Acquisition of fixed assets (73) (17)
Disbursements for patents and other intangible assets (140) (177)
Net cash used in investing activities (213) (194)
Cash flows from financing activities:    
Proceeds from issuance of common stock, net of offering costs 5,309 6,053
Proceeds from exercise of stock options and warrants 385 126
Proceeds from Payroll Protection Program loan   251
Net cash provided by financing activities 5,694 6,430
Effect of exchange rate changes on cash and cash equivalents 9  
Net increase in cash and cash equivalents (1,217) 272
Cash and cash equivalents, beginning of year 8,824 8,552
Cash and cash equivalents, end of year $ 7,607 $ 8,824