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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
Net loss	$ (38,755)us-gaap_NetIncomeLoss	$ (43,337)us-gaap_NetIncomeLoss	$ (15,917)us-gaap_NetIncomeLoss
Other comprehensive income (loss):
Net unrealized gains (losses) on available-for-sale securities, net of taxes	(38)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	7us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Comprehensive loss	$ (38,793)us-gaap_ComprehensiveIncomeNetOfTax	$ (43,330)us-gaap_ComprehensiveIncomeNetOfTax	$ (15,917)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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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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