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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Comprehensive Income [Abstract]      
Net income $ 8,190us-gaap_NetIncomeLoss $ 1,789us-gaap_NetIncomeLoss $ 31,704us-gaap_NetIncomeLoss
Other comprehensive loss, net of tax:      
Unrealized loss on short-term investments (95)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (2)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Comprehensive income $ 8,095us-gaap_ComprehensiveIncomeNetOfTax $ 1,787us-gaap_ComprehensiveIncomeNetOfTax $ 31,704us-gaap_ComprehensiveIncomeNetOfTax