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Condensed Statements of Cash Flows (USD $)
 3 Months Ended 74 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Cash flows from operating activities:      
Net loss $ (1,646,000) $ (1,357,000) $ (15,610,000)
Adjustments to reconcile net loss to net cash used in operating activities:      
Common stock issued or issuable for services 55,000 37,000 1,836,000
Share based payments 81,000 39,000 549,000
Depreciation 58,000 52,000 424,000
Abandonment of capitalized patents 8,000 0 12,000
Deferred rent 9,000 (1,000) 40,000
Change in operating assets and liabilities:      
Prepaid expenses 76,000 15,000 (42,000)
Other assets 0 0 (10,000)
Accounts payable (13,000) 49,000 778,000
Accrued compensation (264,000) 97,000 437,000
Net cash used in operating activities (1,636,000) (1,069,000) (11,586,000)
Cash flows from investing activities:      
Acquisition of fixed assets (17,000) (141,000) (789,000)
Disbursements for patents and other intangible assets (328,000) (162,000) (1,791,000)
Net cash used in investing activities (345,000) (303,000) (2,580,000)
Cash flows from financing activities:      
Proceeds from issuance of common stock for cash, net of offering costs 5,796,000 0 20,717,000
Proceeds from issuance of short term promissory note 0 0 98,000
Principal payments on promissory notes 0 0 (146,000)
Net cash provided by financing activities 5,796,000 0 20,669,000
Net increase (decrease) in cash and cash equivalents 3,815,000 (1,372,000) 6,503,000
Cash and cash equivalents, beginning of period 2,688,000 8,027,000 0
Cash and cash equivalents, end of period 6,503,000 6,655,000 6,503,000
Supplemental disclosure of cash flow information:      
Cash paid during the period for interest $ 0 $ 0 $ 1,000