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Selected Balance Sheet Accounts (Details 4) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Selected Balance Sheet Accounts [Abstract]    
Compensation and related costs $ 4,989us-gaap_EmployeeRelatedLiabilitiesCurrent $ 3,540us-gaap_EmployeeRelatedLiabilitiesCurrent
Other accrued expenses 3,543us-gaap_AccountsPayableAndOtherAccruedLiabilities 3,209us-gaap_AccountsPayableAndOtherAccruedLiabilities
Amounts due to customers 267us-gaap_PayablesToCustomers 208us-gaap_PayablesToCustomers
Other current liabilities 696us-gaap_OtherLiabilitiesCurrent 691us-gaap_OtherLiabilitiesCurrent
Total accrued expenses and other current liabilities $ 9,495us-gaap_AccruedLiabilitiesAndOtherLiabilities $ 7,648us-gaap_AccruedLiabilitiesAndOtherLiabilities