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Condensed Consolidated Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net loss $ (6,959,000) $ (7,087,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 176,000 258,000
Share based compensation 170,000 284,000
Depreciation and amortization 267,000 209,000
Abandonment and impairment of capitalized patents pending 35,000 0
Change in operating assets and liabilities:    
Contract assets 145,000 (126,000)
Accounts receivable 0 103,000
Prepaid expenses and other assets (210,000) (40,000)
Accounts payable and accrued liabilities 10,000 116,000
Accrued compensation and taxes 43,000 322,000
Contract liabilities 0 (115,000)
Net cash used in operating activities (6,323,000) (6,076,000)
Cash flows from investing activities:    
Acquisition of fixed assets (44,000) (89,000)
Disbursements for patents and other intangible assets (313,000) (250,000)
Net cash used in investing activities (357,000) (339,000)
Cash flows from financing activities:    
Proceeds from issuance of common stock and units of common stock and warrants for cash, net of offering costs 23,511,000 8,667,000
Net cash provided by financing activities 23,511,000 8,667,000
Net increase in cash and cash equivalents 16,831,000 2,252,000
Cash and cash equivalents, beginning of period 1,247,000 1,259,000
Cash and cash equivalents, end of period $ 18,078,000 $ 3,511,000