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Condensed Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net loss $ (12,953) $ (4,921)
Adjustments to reconcile net loss to net cash used in operating activities:    
Loss from discontinued operations 0 91
Depreciation and amortization 70 51
Stock-based compensation 1,835 778
Amortization of debt discount 130 40
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 157 (40)
Accounts payable 1,330 198
Accrued expenses 1,470 (304)
Net cash used in operating activities (7,961) (4,107)
Cash flows from investing activities:    
Purchases of property and equipment (435) (423)
Net cash used in investing activities (435) (423)
Cash flows from financing activities:    
Proceeds from warrant exercise 600 0
Proceeds from stock option exercise 12 0
Net cash provided by financing activities 612 0
Net decrease in cash and cash equivalents (7,784) (4,530)
Cash and cash equivalents, beginning of period 53,506 17,974
Cash and cash equivalents, end of period $ 45,722 $ 13,444