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Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accrued Liabilities [Abstract]    
Accrued compensation $ 7,050us-gaap_AccruedSalariesCurrent $ 5,767us-gaap_AccruedSalariesCurrent
Accrued commissions 1,605us-gaap_AccruedSalesCommissionCurrent 1,666us-gaap_AccruedSalesCommissionCurrent
Accrued restructuring 360us-gaap_RestructuringReserve 902us-gaap_RestructuringReserve
Other accrued liabilities 3,854us-gaap_OtherAccruedLiabilitiesCurrent 4,539us-gaap_OtherAccruedLiabilitiesCurrent
Accrued Liabilities, Current $ 12,869us-gaap_AccruedLiabilitiesCurrent $ 12,874us-gaap_AccruedLiabilitiesCurrent