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REVOLVING CREDIT FACLITY - Narrative (Details) (USD $)
0 Months Ended
Apr. 12, 2013
Oct. 21, 2014
Quarter
Oct. 20, 2014
Mar. 30, 2015
Dec. 31, 2013
Dec. 31, 2014
Line of Credit Facility [Line Items]            
Debt issuance costs $ 400,000us-gaap_DebtIssuanceCosts          
Revolving credit facility, amount outstanding         14,000,000us-gaap_LineOfCredit  
Revolving credit facility            
Line of Credit Facility [Line Items]            
Revolving credit facility, term 3 years          
Revolving credit facility, maximum borrowing capacity 25,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
         
Effective interest rate           3.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Percentage monthly commitment fee on unused portion of credit facility 0.375%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
         
Revolving credit facility, amount outstanding         14,000,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Alternative base rate | Federal funds effective rate | Revolving credit facility            
Line of Credit Facility [Line Items]            
Variable rate 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ mtsn_InterestRateOptionsAxis
= mtsn_AlternativeBaseRateMember
/ us-gaap_VariableRateAxis
= mtsn_FederalFundsEffectiveRateMember
         
Alternative base rate | Prime rate | Revolving credit facility            
Line of Credit Facility [Line Items]            
Interest rate increase in an event of default 2.00%mtsn_LineOfCreditFacilityIncreaseOfInterestRateIfEventOfDefaultOccurs
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ mtsn_InterestRateOptionsAxis
= mtsn_AlternativeBaseRateMember
/ us-gaap_VariableRateAxis
= us-gaap_PrimeRateMember
         
Eurodollar rate | Revolving credit facility            
Line of Credit Facility [Line Items]            
Denominator of applicable margin 1mtsn_DenominatorOfApplicableMargin
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ mtsn_InterestRateOptionsAxis
= mtsn_EurodollarRateMember
         
Amended agreement No. 4 | Revolving credit facility            
Line of Credit Facility [Line Items]            
Revolving credit facility, one time additional borrowing   25,000,000mtsn_LineofCreditFacilityAdditionalBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= mtsn_AmendedCreditFacilityMember
       
Credit agreement, borrowing base components, percentage of eligible accounts receivable and advance billings   85.00%mtsn_LineOfCreditFacilityBorrowingBaseComponentsPercentageOfEligibleAccountsReceivableAndAdvanceBillings
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= mtsn_AmendedCreditFacilityMember
       
Credit agreement, borrowing base components, percentage of eligible inventory minus reserves   50.00%mtsn_LineOfCreditFacilityBorrowingBaseComponentsPercentageOfEligibleInventoryMinusReserves
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= mtsn_AmendedCreditFacilityMember
       
Revolving credit facility, minimum EBITDA   2,000,000mtsn_RevolvingCreditFacilityMinimumEBITDA
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= mtsn_AmendedCreditFacilityMember
6,000,000mtsn_RevolvingCreditFacilityMinimumEBITDA
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= mtsn_AmendedCreditFacilityMember
     
Number of consecutive quarters immediately prior to end of reporting period to determine minimum EBITDA   2mtsn_NumberOfFiscalQuartersMostRecentlyEndedForConsolidatedEbitda
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= mtsn_AmendedCreditFacilityMember
       
Minimum quick ratio   1.00mtsn_ConsolidatedQuickRatio
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= mtsn_AmendedCreditFacilityMember
       
Covenant, minimum available funds   30,000,000mtsn_LineofCreditFacilityCovenantAvailableFunds
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= mtsn_AmendedCreditFacilityMember
       
Commitment fee   $ 62,500us-gaap_LineOfCreditFacilityCommitmentFeeAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= mtsn_AmendedCreditFacilityMember
       
Amended agreement No. 4 | Alternative base rate | Revolving credit facility            
Line of Credit Facility [Line Items]            
Variable rate   0.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= mtsn_AmendedCreditFacilityMember
/ mtsn_InterestRateOptionsAxis
= mtsn_AlternativeBaseRateMember
       
Amended agreement No. 4 | Eurodollar rate | Revolving credit facility            
Line of Credit Facility [Line Items]            
Variable rate   2.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= mtsn_AmendedCreditFacilityMember
/ mtsn_InterestRateOptionsAxis
= mtsn_EurodollarRateMember
       
Forecast | Amended agreement No. 4 | Revolving credit facility            
Line of Credit Facility [Line Items]            
Minimum quick ratio       1.25mtsn_ConsolidatedQuickRatio
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= mtsn_AmendedCreditFacilityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember