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Condensed Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net loss $ (4,667,000) $ (4,615,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 117,000 174,000
Share based compensation 111,000 219,000
Depreciation and amortization 167,000 135,000
Change in operating assets and liabilities:    
Contract assets 145,000 (84,000)
Prepaid expenses and other assets (327,000) (28,000)
Accounts payable and accrued liabilities 41,000 (105,000)
Accrued compensation and taxes (168,000) 176,000
Contract liabilities 0 (102,000)
Net cash used in operating activities (4,581,000) (4,230,000)
Cash flows from investing activities:    
Acquisition of fixed assets (19,000) (57,000)
Disbursements for patents and other intangible assets (211,000) (179,000)
Net cash used in investing activities (230,000) (236,000)
Cash flows from financing activities:    
Proceeds from issuance of common stock and units of common stock and warrants for cash, net of offering costs 11,923,000 8,667,000
Net cash provided by financing activities 11,923,000 8,667,000
Net increase in cash and cash equivalents 7,112,000 4,201,000
Cash and cash equivalents, beginning of period 1,247,000 1,259,000
Cash and cash equivalents, end of period $ 8,359,000 $ 5,460,000