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INCOME TAXES - Components of income tax expense (benefit) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current income tax expense (benefit):      
Federal $ 11us-gaap_CurrentFederalTaxExpenseBenefit $ 95us-gaap_CurrentFederalTaxExpenseBenefit $ 41us-gaap_CurrentFederalTaxExpenseBenefit
State 7us-gaap_CurrentStateAndLocalTaxExpenseBenefit 62us-gaap_CurrentStateAndLocalTaxExpenseBenefit 140us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign 29us-gaap_CurrentForeignTaxExpenseBenefit 26us-gaap_CurrentForeignTaxExpenseBenefit 33us-gaap_CurrentForeignTaxExpenseBenefit
Total current expense (benefit) 47us-gaap_CurrentIncomeTaxExpenseBenefit 183us-gaap_CurrentIncomeTaxExpenseBenefit 214us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax expense (benefit)      
Federal 1,181us-gaap_DeferredFederalIncomeTaxExpenseBenefit (583)us-gaap_DeferredFederalIncomeTaxExpenseBenefit 560us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State 123us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (54)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 46us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign         
Total deferred expense (benefit) 1,304us-gaap_DeferredIncomeTaxExpenseBenefit (637)us-gaap_DeferredIncomeTaxExpenseBenefit 606us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense (benefit) $ 1,351us-gaap_IncomeTaxExpenseBenefitContinuingOperationsDiscontinuedOperationsExtraordinaryItems $ (454)us-gaap_IncomeTaxExpenseBenefitContinuingOperationsDiscontinuedOperationsExtraordinaryItems $ 820us-gaap_IncomeTaxExpenseBenefitContinuingOperationsDiscontinuedOperationsExtraordinaryItems