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ACCRUED EXPENSES AND OTHER LIABILITIES - Summary of accrued expenses and other liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
ACCRUED EXPENSES AND OTHER LIABILITIES    
Accrued payroll and related expenses $ 1,935us-gaap_EmployeeRelatedLiabilitiesCurrent $ 1,393us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued sales incentives and discounts 2,671mpx_AccruedSalesIncentivesAndDiscountsCurrent 3,025mpx_AccruedSalesIncentivesAndDiscountsCurrent
Accrued warranty costs 3,836us-gaap_ProductWarrantyAccrualClassifiedCurrent 3,410us-gaap_ProductWarrantyAccrualClassifiedCurrent
Deferred revenue 706us-gaap_DeferredRevenue 836us-gaap_DeferredRevenue
Other 483us-gaap_OtherAccruedLiabilitiesCurrent 329us-gaap_OtherAccruedLiabilitiesCurrent
Total accrued expenses and other liabilities $ 9,631mpx_AccruedExpensesAndOtherCurrentLiabilities $ 8,993mpx_AccruedExpensesAndOtherCurrentLiabilities