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Consolidated Statements of Comprehensive Loss (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Consolidated Statements of Comprehensive Loss    
Net loss $ (37,915)us-gaap_NetIncomeLoss $ (14,098)us-gaap_NetIncomeLoss
Other comprehensive loss:    
Unrealized gain on marketable securities 125us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent 10us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent
Foreign currency translation loss (124)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent  
Comprehensive loss $ (37,914)us-gaap_ComprehensiveIncomeNetOfTax $ (14,088)us-gaap_ComprehensiveIncomeNetOfTax