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Stock Benefit Plans Narrative (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Compensation expense not yet recognized $ 1.1us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
Period for recognition (in years) 1 year 2 months 12 days
Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Equity-based awards outstanding (in shares) 56,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Stock Options | 2004 Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Option term (in years) 7 years
Equity-based awards outstanding (in shares) 73,969us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= sxcl_A2004PlanMember
Stock Options | 2004 Plan | Employees Who Own More Than 10% of the Voting Power of All Classes of Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Option term (in years) 5 years
Ownership in voting powers ( as a percent) 10.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= sxcl_A2004PlanMember
/ us-gaap_TitleOfIndividualAxis
= sxcl_EmployeesWhoOwnMoreThan10oftheVotingPowerofAllClassesofStockMember
Exercise price as a percentage of fair value of common stock 110.00%sxcl_SharebasedCompensationArrangementbySharebasedPaymentAwardExercisePriceasaPercentageofFairMarketValueofCommonStock
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= sxcl_A2004PlanMember
/ us-gaap_TitleOfIndividualAxis
= sxcl_EmployeesWhoOwnMoreThan10oftheVotingPowerofAllClassesofStockMember
Stock Options | 2004 Plan | Other Employees and Consultants  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price as a percentage of fair value of common stock 100.00%sxcl_SharebasedCompensationArrangementbySharebasedPaymentAwardExercisePriceasaPercentageofFairMarketValueofCommonStock
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= sxcl_A2004PlanMember
/ us-gaap_TitleOfIndividualAxis
= sxcl_OtherEmployeesandConsultantsMember
Stock Options | 2004 Plan | Other Employees and Consultants | Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price as a percentage of fair value of common stock 85.00%sxcl_SharebasedCompensationArrangementbySharebasedPaymentAwardExercisePriceasaPercentageofFairMarketValueofCommonStock
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= sxcl_A2004PlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TitleOfIndividualAxis
= sxcl_OtherEmployeesandConsultantsMember
Stock Options | 2006 Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Option term (in years) 10 years
Exercise price as a percentage of fair value of common stock 100.00%sxcl_SharebasedCompensationArrangementbySharebasedPaymentAwardExercisePriceasaPercentageofFairMarketValueofCommonStock
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= sxcl_A2006PlanMember
Equity-based awards outstanding (in shares) 38,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= sxcl_A2006PlanMember
Stock Appreciation Rights (SARs) | 2004 Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Option term (in years) 7 years
Exercise price as a percentage of fair value of common stock 100.00%sxcl_SharebasedCompensationArrangementbySharebasedPaymentAwardExercisePriceasaPercentageofFairMarketValueofCommonStock
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= sxcl_A2004PlanMember
Stock Appreciation Rights (SARs) | 2006 Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Option term (in years) 10 years
Exercise price as a percentage of fair value of common stock 100.00%sxcl_SharebasedCompensationArrangementbySharebasedPaymentAwardExercisePriceasaPercentageofFairMarketValueofCommonStock
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_PlanNameAxis
= sxcl_A2006PlanMember
Restricted Stock | 2004 Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Purchase price (in dollars per share) $ 0.001us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= sxcl_A2004PlanMember
Common Stock | 2004 Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares reserved for future issuance (in shares) 1,805,613us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= sxcl_A2004PlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
Shares available for issuance (in shares) 1,543,891us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= sxcl_A2004PlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
Common Stock | 2006 Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares reserved for future issuance (in shares) 1,200,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= sxcl_A2006PlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
Shares available for issuance (in shares) 401,545us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= sxcl_A2006PlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember