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Restructuring Charges (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Position
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Restructuring Charges [Abstract]        
Number of workforce reduced 93us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated      
Percentage of reduction in workforce (in hundredths) 11.00%us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminatedPeriodPercent      
Restructuring charge $ 907us-gaap_RestructuringCharges $ 907us-gaap_RestructuringCharges $ 0us-gaap_RestructuringCharges $ 0us-gaap_RestructuringCharges