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Commitments and Contingencies (Narrative 2) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Commitments And Contingencies Narrative 2 Details      
Purchases under contractual inventory commitments from third-party contract manufacturers $ 14.8npsp_PurchasesUnderContractualInventoryCommitmentsFromThirdpartyContractManufacturers $ 15.0npsp_PurchasesUnderContractualInventoryCommitmentsFromThirdpartyContractManufacturers $ 25.9npsp_PurchasesUnderContractualInventoryCommitmentsFromThirdpartyContractManufacturers