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Selected Balance Sheet Accounts (Details 4) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Selected Balance Sheet Accounts [Abstract]    
Compensation and related costs $ 1,827us-gaap_EmployeeRelatedLiabilitiesCurrent $ 5,149us-gaap_EmployeeRelatedLiabilitiesCurrent
Professional fees and other accrued expenses 3,964abtl_PreofessionalFeesAndOtherAccruedExpenses 3,383abtl_PreofessionalFeesAndOtherAccruedExpenses
Amounts due to customers 291abtl_AmountsDueToCustomers 267abtl_AmountsDueToCustomers
Other current liabilities 558us-gaap_OtherLiabilitiesCurrent 696us-gaap_OtherLiabilitiesCurrent
Total accrued expenses and other current liabilities $ 6,640us-gaap_AccruedLiabilitiesAndOtherLiabilities $ 9,495us-gaap_AccruedLiabilitiesAndOtherLiabilities