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Condensed Consolidated Statements of Comprehensive Loss (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Comprehensive Income [Abstract]    
Net loss $ (7,826)us-gaap_NetIncomeLoss $ (8,981)us-gaap_NetIncomeLoss
Unrealized gain on cash equivalents and marketable securities, net of tax 0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 1us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Total comprehensive loss $ (7,826)us-gaap_ComprehensiveIncomeNetOfTax $ (8,980)us-gaap_ComprehensiveIncomeNetOfTax