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Condensed Statement of Cash Flows (Unaudited) (USD $)
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net loss $ (28,367,000) $ (9,490,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Loss from discontinued operations   134,000
Depreciation and amortization 149,000 94,000
Stock-based compensation 4,238,000 1,793,000
Amortization of debt discount 261,000 136,000
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 206,000 (291,000)
Accounts payable 2,849,000 (74,000)
Accrued expenses 1,882,000 (380,000)
Net cash used in operating activities (18,782,000) (8,078,000)
Cash flows from investing activities:    
Purchases of property and equipment (541,000) (467,000)
Net cash used in investing activities (541,000) (467,000)
Cash flows from financing activities:    
Proceeds from convertible note financing   3,000,000
Proceeds from warrant exercise 600,000  
Proceeds from stock option exercise 41,000  
Proceeds from the issuance of shares under the Employee Stock Purchase Plan 25,000 13,000
Net cash provided by financing activities 666,000 3,013,000
Net decrease in cash and cash equivalents (18,657,000) (5,532,000)
Cash and cash equivalents, beginning of period 53,506,000 17,974,000
Cash and cash equivalents, end of period $ 34,849,000 $ 12,442,000