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Condensed Statements of Cash Flows (USD $)
 3 Months Ended 62 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Cash flows from operating activities:      
Net loss $ (1,357,000) $ (865,000) $ (10,036,000)
Adjustments to reconcile net loss to net cash used in operating activities:      
Common stock issued or issuable for services 37,000 18,000 1,566,000
Share based payments 39,000 48,000 361,000
Depreciation 52,000 13,000 209,000
Deferred rent (1,000) 18,000 34,000
Change in operating assets and liabilities:      
Prepaid expenses 15,000 (507,000) (45,000)
Other assets 0 10,000 (10,000)
Accounts payable 49,000 439,000 819,000
Accrued compensation 97,000 205,000 380,000
Net cash used in operating activities (1,069,000) (621,000) (6,722,000)
Cash flows from investing activities:      
Acquisition of fixed assets (141,000) (26,000) (677,000)
Disbursements for patents and other intangible assets (162,000) (28,000) (780,000)
Net cash used in investing activities (303,000) (54,000) (1,457,000)
Cash flows from financing activities:      
Proceeds from issuance of common stock for cash, net of offering costs 0 0 14,882,000
Proceeds from issuance of short term promissory note 0 0 98,000
Principal payments on promissory notes 0 (13,000) (146,000)
Net cash provided by (used in) financing activities 0 (13,000) 14,834,000
Net increase (decrease) in cash and cash equivalents (1,372,000) (688,000) 6,655,000
Cash and cash equivalents, beginning of period 8,027,000 930,000 0
Cash and cash equivalents, end of period 6,655,000 242,000 6,655,000
Supplemental disclosure of cash flow information:      
Cash paid during the period for interest $ 0 $ 1,000 $ 1,000