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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	$ (26,217)us-gaap_NetIncomeLoss	$ (13,840)us-gaap_NetIncomeLoss
Other comprehensive (loss) income:
Unrealized gain on marketable securities available-for-sale	8us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	69us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Cumulative foreign currency translation adjustments	(1,294)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	(9)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Total other comprehensive (loss) gain	(1,286)us-gaap_OtherComprehensiveIncomeLossNetOfTax	60us-gaap_OtherComprehensiveIncomeLossNetOfTax
Total comprehensive loss	$ (27,503)us-gaap_ComprehensiveIncomeNetOfTax	$ (13,780)us-gaap_ComprehensiveIncomeNetOfTax

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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