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COMMITMENTS AND CONTINGENCIES (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Minimum future rental commitments under all non-cancelable operating leases    
2015 $ 1,846us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent  
2016 1,478us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears  
2017 1,204us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears  
2018 980us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears  
2019 648us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears  
Thereafter 2,565us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter  
Minimum future rental commitments 8,721us-gaap_OperatingLeasesFutureMinimumPaymentsDue  
Rental expense    
Rental expense 1,976us-gaap_OperatingLeasesRentExpenseNet 1,248us-gaap_OperatingLeasesRentExpenseNet
Severance Benefit Agreements    
Severance benefit agreements    
Period of specified benefits to key employees Upon the subsequent severance of employment 24 months  
Severance payments that could be required to be paid $ 5,878us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= amot_SeveranceBenefitAgreementsMember
$ 5,396us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= amot_SeveranceBenefitAgreementsMember