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Consolidated Statements of Comprehensive Loss (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Comprehensive Income [Abstract]      
Net loss $ (39,674)us-gaap_NetIncomeLoss $ (43,413)us-gaap_NetIncomeLoss $ (89,266)us-gaap_NetIncomeLoss
Unrealized gain (loss) on cash equivalents and marketable securities, net of tax (5)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (9)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 22us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Total comprehensive loss $ (39,679)us-gaap_ComprehensiveIncomeNetOfTax $ (43,422)us-gaap_ComprehensiveIncomeNetOfTax $ (89,244)us-gaap_ComprehensiveIncomeNetOfTax