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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]    
Net loss $ (46,913)us-gaap_NetIncomeLoss $ (30,726)us-gaap_NetIncomeLoss
Other comprehensive income (loss):    
Unrealized gain (loss) on available-for-sale securities, net of tax 169us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (28)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Total comprehensive loss $ (46,744)us-gaap_ComprehensiveIncomeNetOfTax $ (30,754)us-gaap_ComprehensiveIncomeNetOfTax