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REVOLVING CREDIT FACILITY - Narrative (Details) (Revolving Credit Facility, USD $)
0 Months Ended
Apr. 12, 2013
Mar. 29, 2015
Dec. 31, 2014
Oct. 21, 2014
Line of Credit Facility [Line Items]        
Line of credit facility term 3 years      
Line of credit facility, maximum borrowing capacity $ 25,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity      
Line of credit facility, outstanding borrowings   0us-gaap_LineOfCredit 0us-gaap_LineOfCredit  
Amended Credit Facility        
Line of Credit Facility [Line Items]        
Line of credit facility, additional borrowing capacity       $ 25,000,000mtsn_LineofCreditFacilityAdditionalBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= mtsn_AmendedCreditFacilityMember