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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
Consolidated statements of comprehensive loss
Net loss	$ (93,753)us-gaap_NetIncomeLoss	$ (51,574)us-gaap_NetIncomeLoss	$ (26,235)us-gaap_NetIncomeLoss
Other comprehensive (loss) income:
Unrealized (loss) gain on marketable securities	(457)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	70us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent
Foreign currency translation loss	(350)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
Comprehensive loss	$ (94,560)us-gaap_ComprehensiveIncomeNetOfTax	$ (51,504)us-gaap_ComprehensiveIncomeNetOfTax	$ (26,235)us-gaap_ComprehensiveIncomeNetOfTax

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- Definition

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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