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Condensed Consolidated Statements of Cash Flows - USD ($)
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net loss $ (2,329,000) $ (2,278,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 3,000 9,000
Share based compensation 233,000 50,000
Depreciation and amortization 70,000 79,000
Accrued interest income (44,000) 0
Change in operating assets and liabilities:    
Contract assets 0 145,000
Accounts receivable 0 (344,000)
Prepaid expenses and other assets 45,000 (121,000)
Accounts payable and accrued liabilities 42,000 379,000
Accrued compensation and taxes (42,000) 221,000
Net cash used in operating activities (2,022,000) (1,860,000)
Cash flows from investing activities:    
Acquisition of fixed assets (11,000) (2,000)
Disbursements for patents and other intangible assets (145,000) (106,000)
Net cash used in investing activities (156,000) (108,000)
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 (decrease) in cash and cash equivalents (2,178,000) 9,955,000
Cash and cash equivalents, beginning of year 8,949,000 1,247,000
Cash and cash equivalents, end of year $ 6,771,000 $ 11,202,000