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Condensed Statements of Cash Flows (USD $)
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities:    
Net loss $ (3,273,000) $ (2,762,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Common stock issued for services 111,000 109,000
Share based payments 162,000 75,000
Depreciation 119,000 102,000
Abandonment of capitalized patents 8,000 0
Deferred rent 7,000 (2,000)
Change in operating assets and liabilities:    
Prepaid expenses (94,000) (117,000)
Accounts payable (81,000) (106,000)
Accrued compensation (70,000) 315,000
Net cash used in operating activities (3,111,000) (2,386,000)
Cash flows from investing activities:    
Acquisition of fixed assets (63,000) (131,000)
Disbursements for patents and other intangible assets (579,000) (346,000)
Net cash used in investing activities (642,000) (477,000)
Cash flows from financing activities:    
Proceeds from issuance of common stock for cash, net of offering costs 5,796,000 0
Net cash provided by financing activities 5,796,000 0
Net increase (decrease) in cash and cash equivalents 2,043,000 (2,863,000)
Cash and cash equivalents, beginning of period 2,688,000 8,027,000
Cash and cash equivalents, end of period 4,731,000 5,164,000
Supplemental disclosure of non-cash investing and financing activities:    
Warrants Authorized For Issuance To Acquire Common Stock Shares Number 20,313  
Warrants Authorized For Issuance To Acquire Common Stock Value $ 92,000