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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:    
Net loss $ (6,886,000) $ (8,482,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 17,000 14,000
Share based compensation 800,000 685,000
Depreciation and amortization 210,000 240,000
Abandonment and impairment of capitalized patent costs 0 733,000
Change in operating assets and liabilities:    
Contract assets (53,000) 0
Prepaid expenses and other assets (75,000) 109,000
Accounts payable and accrued liabilities (382,000) (236,000)
Accrued compensation and taxes 361,000 (15,000)
Contract liabilities 44,000 50,000
Net cash used in operating activities (5,964,000) (6,902,000)
Cash flows from investing activities:    
Acquisition of fixed assets (17,000) (20,000)
Disbursements for patents and other intangible assets (177,000) (398,000)
Maturity of short term treasury bills 0 6,923,000
Net cash provided by (used in) investing activities (194,000) 6,505,000
Cash flows from financing activities:    
Proceeds from issuance of common stock, net of offering costs 6,053,000 0
Proceeds from exercise of stock options 126,000  
Proceeds from Payroll Protection Program loan 251,000  
Net cash provided by financing activities 6,430,000 0
Net increase (decrease) in cash and cash equivalents 272,000 (397,000)
Cash and cash equivalents, beginning of period 8,552,000 8,949,000
Cash and cash equivalents, end of period $ 8,824,000 $ 8,552,000