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Condensed Statements of Cash Flows - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net loss $ (2,589,000) $ (1,583,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 47,000 25,000
Share based payments 168,000 116,000
Depreciation and amortization 42,000 56,000
Abandonment of capitalized patents pending 65,000 0
Deferred rent (4,000) (3,000)
Change in operating assets and liabilities:    
Prepaid expenses 29,000 (2,000)
Accounts payable 35,000 (53,000)
Accrued compensation (516,000) (391,000)
Net cash used in operating activities (2,723,000) (1,835,000)
Cash flows from investing activities:    
Acquisition of fixed assets (11,000) (17,000)
Disbursements for patents and other intangible assets (370,000) (335,000)
Net cash used in investing activities (381,000) (352,000)
Cash flows from financing activities:    
Proceeds from issuance of common stock for cash, net of offering costs 0 16,279,000
Proceeds from exercise of stock options 0 253,000
Net cash provided by financing activities 0 16,532,000
Net increase (decrease) in cash and cash equivalents (3,104,000) 14,345,000
Cash and cash equivalents, beginning of year 10,985,000 1,845,000
Cash and cash equivalents, end of year $ 7,881,000 $ 16,190,000