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Condensed Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities:    
Net loss $ (3,354,000) $ (4,755,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 5,000 7,000
Share based compensation 238,000 443,000
Depreciation and amortization 108,000 130,000
Abandonment and impairment of capitalized patent costs 0 396,000
Change in operating assets and liabilities:    
Contract assets (28,000) (3,000)
Prepaid expenses and other assets (137,000) (129,000)
Accounts payable and accrued liabilities (144,000) (136,000)
Accrued compensation and taxes 277,000 80,000
Contract liabilities (2,000) 0
Net cash used in operating activities (3,037,000) (3,967,000)
Cash flows from investing activities:    
Acquisition of fixed assets 0 (17,000)
Disbursements for patents and other intangible assets (116,000) (243,000)
Maturity of short term treasury bills 0 4,935,000
Net cash provided by (used in) investing activities (116,000) 4,675,000
Cash flows from financing activities:    
Proceeds from exercise of stock options 22,000 0
Proceeds from Payroll Protection Program loan 251,000 0
Net cash provided by financing activities 273,000 0
Net increase (decrease) cash and cash equivalents (2,880,000) 708,000
Cash and cash equivalents, beginning of period 8,552,000 8,949,000
Cash and cash equivalents, end of period $ 5,672,000 $ 9,657,000