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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:    
Net loss $ (8,482,000) $ (9,500,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 14,000 242,000
Share based compensation 685,000 224,000
Depreciation and amortization 240,000 271,000
Abandonment and impairment of capitalized patent costs 733,000 322,000
Change in operating assets and liabilities:    
Contract assets 0 145,000
Prepaid expenses and other assets 109,000 (134,000)
Accounts payable and accrued liabilities (236,000) 312,000
Accrued compensation and taxes (15,000) (266,000)
Contract liabilities 50,000  
Net cash used in operating activities (6,902,000) (8,384,000)
Cash flows from investing activities:    
Acquisition of fixed assets (20,000) (94,000)
Disbursements for patents and other intangible assets (398,000) (408,000)
Maturity of short term treasury bills 6,923,000 (6,923,000)
Net cash provided by (used in) investing activities 6,505,000 (7,425,000)
Cash flows from financing activities:    
Proceeds from issuance of common stock, net of offering costs 0 23,511,000
Net cash provided by financing activities 0 23,511,000
Net increase (decrease) in cash and cash equivalents (397,000) 7,702,000
Cash and cash equivalents, beginning of period 8,949,000 1,247,000
Cash and cash equivalents, end of period $ 8,552,000 $ 8,949,000