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Condensed Statements of Cash Flows (USD $)
 9 Months Ended 68 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Cash flows from operating activities:      
Net loss $ (4,125,000) $ (3,017,000) $ (12,804,000)
Adjustments to reconcile net loss to net cash used in operating activities:      
Common stock issued or issuable for services 181,000 119,000 1,710,000
Share based payments 110,000 116,000 432,000
Depreciation 154,000 60,000 311,000
Abandonment of capitalized patent 4,000 0 4,000
Deferred rent (2,000) 18,000 33,000
Change in operating assets and liabilities:      
Prepaid expenses (94,000) 323,000 (154,000)
Other assets 0 10,000 (10,000)
Accounts payable (71,000) 156,000 699,000
Accrued compensation 538,000 301,000 821,000
Net cash used in operating activities (3,305,000) (1,914,000) (8,958,000)
Cash flows from investing activities:      
Acquisition of fixed assets (170,000) (286,000) (706,000)
Disbursements for patents and other intangible assets (602,000) (242,000) (1,220,000)
Net cash used in investing activities (772,000) (528,000) (1,926,000)
Cash flows from financing activities:      
Proceeds from issuance of common stock for cash, net of offering costs 39,000 11,200,000 14,921,000
Proceeds from issuance of short term promissory note 0 98,000 98,000
Principal payments on promissory notes 0 (146,000) (146,000)
Net cash provided by financing activities 39,000 11,152,000 14,873,000
Net increase (decrease) in cash and cash equivalents (4,038,000) 8,710,000 3,989,000
Cash and cash equivalents, beginning of period 8,027,000 930,000 0
Cash and cash equivalents, end of period 3,989,000 9,640,000 3,989,000
Supplemental disclosure of cash flow information:      
Cash paid during the period for interest $ 0 $ 1,000 $ 1,000