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Condensed Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from operating activities:    
Net loss $ (5,020,000) $ (3,379,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 95,000 62,000
Share based payments 330,000 355,000
Depreciation and amortization 90,000 112,000
Abandonment of capitalized patents pending 232,000 5,000
Deferred rent (9,000) (6,000)
Change in operating assets and liabilities:    
Prepaid expenses (332,000) (145,000)
Accounts payable 103,000 174,000
Accrued compensation (390,000) (340,000)
Net cash used in operating activities (4,901,000) (3,162,000)
Cash flows from investing activities:    
Acquisition of fixed assets (60,000) (30,000)
Disbursements for patents and other intangible assets (651,000) (611,000)
Net cash used in investing activities (711,000) (641,000)
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 0 285,000
Net cash provided by financing activities 0 16,564,000
Net increase (decrease) in cash and cash equivalents (5,612,000) 12,761,000
Cash and cash equivalents, beginning of period 10,985,000 1,845,000
Cash and cash equivalents, end of period $ 5,373,000 $ 14,606,000