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Stock-Based Compensation - Stock-based Compensation (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation $ 1,066us-gaap_ShareBasedCompensation $ 454us-gaap_ShareBasedCompensation $ 630us-gaap_ShareBasedCompensation
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
General and administrative 592us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 337us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 355us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
General and administrative 121us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		 54us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember		 188us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Performance Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
General and administrative $ 353us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= nls_PerformanceStockUnitsMember		 $ 63us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= nls_PerformanceStockUnitsMember		 $ 87us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= nls_PerformanceStockUnitsMember