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Stock Plans (Reservation of Shares for Issuance) (Details)
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total reservation of shares under stock compensation plans 2,721,017us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Incentive Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total reservation of shares under stock compensation plans 1,574,258us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= mxwl_IncentivePlanMember
Employee Stock Purchase Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total reservation of shares under stock compensation plans 474,748us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
Omnibus Equity Incentive Plan 2005 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total reservation of shares under stock compensation plans 672,011us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= mxwl_OmnibusEquityIncentivePlan2005Member