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Condensed Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net loss $ (4,755,000) $ (4,667,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 7,000 117,000
Share based compensation 443,000 111,000
Depreciation and amortization 130,000 167,000
Abandonment and impairment of capitalized patent costs 396,000 0
Change in operating assets and liabilities:    
Contract assets (3,000) 145,000
Prepaid expenses and other assets (129,000) (327,000)
Accounts payable and accrued liabilities (136,000) 41,000
Accrued compensation and taxes 80,000 (168,000)
Net cash used in operating activities (3,967,000) (4,581,000)
Cash flows from investing activities:    
Acquisition of fixed assets (17,000) (19,000)
Disbursements for patents and other intangible assets (243,000) (211,000)
Maturity of short term treasury bills 4,935,000 0
Net cash provided by (used in) investing activities 4,675,000 (230,000)
Cash flows from financing activities:    
Proceeds from issuance of common stock, net of offering costs 0 11,923,000
Net cash provided by financing activities 0 11,923,000
Net increase in cash and cash equivalents 708,000 7,112,000
Cash and cash equivalents, beginning of year 8,949,000 1,247,000
Cash and cash equivalents, end of year $ 9,657,000 $ 8,359,000