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Consolidated Statements of Comprehensive Income (Loss) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Consolidated Statements of Comprehensive Income (Loss)      
Net income (loss) $ 19,871us-gaap_NetIncomeLoss $ (92,273)us-gaap_NetIncomeLoss $ (46,284)us-gaap_NetIncomeLoss
Other comprehensive income (loss):      
Unrealized net (loss) gain on marketable securities (154)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent 57us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent (58)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent
Other comprehensive income (loss): (154)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 57us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (58)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income (loss) $ 19,717us-gaap_ComprehensiveIncomeNetOfTax $ (92,216)us-gaap_ComprehensiveIncomeNetOfTax $ (46,342)us-gaap_ComprehensiveIncomeNetOfTax