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Condensed Consolidated Statements of Cash Flows - USD ($)
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities:    
Net loss $ (1,963,000) $ (2,329,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 2,000 3,000
Share based compensation 143,000 233,000
Depreciation and amortization 58,000 70,000
Accrued interest income 0 (44,000)
Change in operating assets and liabilities:    
Prepaid expenses and other assets 57,000 45,000
Accounts payable and accrued liabilities 213,000 42,000
Accrued compensation and taxes 100,000 (42,000)
Net cash used in operating activities (1,390,000) (2,022,000)
Cash flows from investing activities:    
Acquisition of fixed assets 0 (11,000)
Disbursements for patents and other intangible assets (78,000) (145,000)
Net cash used in investing activities (78,000) (156,000)
Net used in cash and cash equivalents (1,468,000) (2,178,000)
Cash and cash equivalents, beginning of period 8,552,000 8,949,000
Cash and cash equivalents, end of period $ 7,084,000 $ 6,771,000