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Consolidated Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash flows from operating activities:    
Net loss $ (5,031,000) $ (6,863,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 8,000 11,000
Share based compensation 421,000 560,000
Depreciation and amortization 158,000 185,000
Abandonment and impairment of capitalized patent costs 0 733,000
Change in operating assets and liabilities:    
Contract assets (198,000) (14,000)
Prepaid expenses and other assets (47,000) (35,000)
Accounts payable and accrued liabilities 65,000 (270,000)
Accrued compensation and taxes 483,000 236,000
Contract liabilities (2,000) 0
Net cash used in operating activities (4,143,000) (5,457,000)
Cash flows from investing activities:    
Acquisition of fixed assets (4,000) (13,000)
Disbursements for patents and other intangible assets (151,000) (326,000)
Maturity of short term treasury bills 0 4,924,000
Net cash provided by (used in) investing activities (155,000) 4,585,000
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 89,000 0
Proceeds from Payroll Protection Program loan 251,000 0
Net cash provided by financing activities 6,393,000 0
Net increase (decrease) in cash and cash equivalents 2,095,000 (872,000)
Cash and cash equivalents, beginning of period 8,552,000 8,949,000
Cash and cash equivalents, end of period $ 10,647,000 $ 8,077,000