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Condensed Consolidated Statements of Cash Flows - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net loss $ (2,278,000) $ (2,379,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 9,000 87,000
Share based compensation 50,000 143,000
Depreciation and amortization 79,000 68,000
Change in operating assets and liabilities:    
Contract assets 145,000 0
Accounts receivable (344,000) (216,000)
Prepaid expenses and other assets (121,000) 223,000
Accounts payable and accrued liabilities 379,000 (170,000)
Accrued compensation and taxes 221,000 49,000
Contract liabilities 0 (72,000)
Net cash used in operating activities (1,860,000) (2,267,000)
Cash flows from investing activities:    
Acquisition of fixed assets (2,000) (28,000)
Disbursements for patents and other intangible assets (106,000) (105,000)
Net cash used in investing activities (108,000) (133,000)
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 9,955,000 6,267,000
Cash and cash equivalents, beginning of period 1,247,000 1,259,000
Cash and cash equivalents, end of period $ 11,202,000 $ 7,526,000