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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	$ (35,670)us-gaap_NetIncomeLoss	$ (38,379)us-gaap_NetIncomeLoss	$ (68,881)us-gaap_NetIncomeLoss
Other comprehensive income (loss):
Net unrealized loss on marketable securities	(70)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	(54)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	(38)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Foreign currency translation adjustments			16us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Reclassification of accumulated foreign currency translation adjustments			153us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax
Other comprehensive (loss) income	(70)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	(54)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	131us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive loss	$ (35,740)us-gaap_ComprehensiveIncomeNetOfTax	$ (38,433)us-gaap_ComprehensiveIncomeNetOfTax	$ (68,750)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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