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COMMITMENTS AND CONTINGENCIES - Schedule of Minimum Annual Lease Commitments with Respect to Operating Leases (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]  
2015 $ 3,356us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
2016 2,774us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
2017 3,054us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
2018 717us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
2019 716us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
Thereafter 716us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter
Total 11,333us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, Fiscal Year Maturity [Abstract]  
2015 (179)mtsn_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsNextTwelveMonths
2016 0mtsn_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsDueInTwoYears
2017 0mtsn_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsDueInThreeYears
2018 0mtsn_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsDueInFourYears
2019 0mtsn_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsDueinFiveYears
Thereafter 0mtsn_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentalsDueThereafter
Total (179)us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals
Operating Leases, Future Minimum Payments Due, Net Of Sublease Rentals, Fiscal Year Maturity [Abstract]  
2015 3,177mtsn_OperatingLeasesFutureMinimumPaymentsDueNetOfSubleaseRentalsNextTwelveMonths
2016 2,774mtsn_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalsDueInTwoYears
2017 3,054mtsn_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalsDueInThreeYears
2018 717mtsn_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalsDueInFourYears
2019 716mtsn_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalsDueInFiveYears
Thereafter 716mtsn_OperatingLeasesFutureMinimumPaymentsNetOfSubleaseRentalsDueThereafter
Total $ 11,154mtsn_OperatingLeasesFutureMinimumPaymentsDueNetOfSubleaseRentals