Collaboration Agreements	12 Months Ended
Dec. 31, 2014
Collaboration Agreements [Abstract]
Collaboration Agreements	Collaboration Agreements AstraZeneca LP In April 2012, the Company entered into an agreement with AstraZeneca LP pursuant to which the Company and AstraZeneca LP agreed to collaborate globally to develop and commercialize certain acute ischemic heart disease compounds. Under the terms of the collaboration agreement, a joint development and research committee and a joint commercialization committee have been established to prepare and deliver a global development plan and a country-by-country collaboration and commercialization plan, respectively, related to BRILINTA and Angiomax and cangrelor. Since inception, the Company has recognized $41.0 million in co-promotion income. The agreement was terminated effective December 31, 2014. Alnylam Pharmaceuticals, Inc. In February 2013, the Company entered into a license and collaboration agreement with Alnylam Pharmaceuticals, Inc. (Alnylam) to develop, manufacture and commercialize therapeutic products targeting the proprotein convertase subtilisin/kexin type 9 (PCSK9) gene, based on certain of Alnylam's RNA interference (RNAi) technology. Under the terms of the agreement, the Company obtained the exclusive, worldwide right under Alnylam's technology to develop, manufacture and commercialize PCSK-9 products for the treatment, palliation and/or prevention of all human diseases. Alnylam is responsible for the development costs of the products, subject to an agreed upon limit, until the completion of Phase 1 clinical studies. The Company is responsible for completing and funding the development costs of the products through commercialization, if successful. The Company paid Alnylam $25 million in an initial license payment, which the Company recorded as research and development expense. The Company has also agreed to pay up to an aggregate of $180 million in success-based development and commercialization milestones. In addition, the Company has agreed to pay specified royalties on net sales of these products. Royalties to Alnylam are payable by the Company on a product-by-product and country-by-country basis until the last to occur of the expiration of patent rights in the applicable country that cover the applicable product, the expiration of non-patent regulatory exclusivities for such product in such country, and the twelfth anniversary of the first commercial sale of the product in such country, subject to reduction in specified circumstances. The Company is also responsible for paying royalties, and in some cases, milestone payments, owed by Alnylam to its licensors with respect to intellectual property covering these products. In December 2014, under the terms of the license and collaboration agreement with Alnylam, Alnylam initiated a Phase 1 clinical trial of ALN-PCSsc in the UK. Upon initiation of the Phase I clinical trial, the Company incurred a $10.0 million milestone. Boston Scientific Corporation In December 2013, the Company entered into a co-promotion agreement with BSX for the Promus PREMIER Stent System, where the Company and BSX agreed to collaborate to provide promotional support for the Promus PREMIER Stent System in hospitals in the United States. Under the terms of the co-promotion agreement, the Company's sales force began collaborating with the BSX Interventional Cardiology sales force in January 2014. Since inception, the Company has recognized $5.0 million in co-promotion income. The agreement was terminated effective December 31, 2014.

Collaboration Agreements

AstraZeneca LP

In April 2012, the Company entered into an agreement with AstraZeneca LP pursuant to which the Company and AstraZeneca LP agreed to collaborate globally to develop and commercialize certain acute ischemic heart disease compounds. Under the terms of the collaboration agreement, a joint development and research committee and a joint commercialization committee have been established to prepare and deliver a global development plan and a country-by-country collaboration and commercialization plan, respectively, related to BRILINTA and Angiomax and cangrelor. Since inception, the Company has recognized $41.0 million in co-promotion income. The agreement was terminated effective December 31, 2014.

Alnylam Pharmaceuticals, Inc.

In February 2013, the Company entered into a license and collaboration agreement with Alnylam Pharmaceuticals, Inc. (Alnylam) to develop, manufacture and commercialize therapeutic products targeting the proprotein convertase subtilisin/kexin type 9 (PCSK9) gene, based on certain of Alnylam's RNA interference (RNAi) technology. Under the terms of the agreement, the Company obtained the exclusive, worldwide right under Alnylam's technology to develop, manufacture and commercialize PCSK-9 products for the treatment, palliation and/or prevention of all human diseases. Alnylam is responsible for the development costs of the products, subject to an agreed upon limit, until the completion of Phase 1 clinical studies. The Company is responsible for completing and funding the development costs of the products through commercialization, if successful. The Company paid Alnylam $25 million in an initial license payment, which the Company recorded as research and development expense. The Company has also agreed to pay up to an aggregate of $180 million in success-based development and commercialization milestones. In addition, the Company has agreed to pay specified royalties on net sales of these products. Royalties to Alnylam are payable by the Company on a product-by-product and country-by-country basis until the last to occur of the expiration of patent rights in the applicable country that cover the applicable product, the expiration of non-patent regulatory exclusivities for such product in such country, and the twelfth anniversary of the first commercial sale of the product in such country, subject to reduction in specified circumstances. The Company is also responsible for paying royalties, and in some cases, milestone payments, owed by Alnylam to its licensors with respect to intellectual property covering these products. In December 2014, under the terms of the license and collaboration agreement with Alnylam, Alnylam initiated a Phase 1 clinical trial of ALN-PCSsc in the UK. Upon initiation of the Phase I clinical trial, the Company incurred a $10.0 million milestone.

Boston Scientific Corporation

In December 2013, the Company entered into a co-promotion agreement with BSX for the Promus PREMIER Stent System, where the Company and BSX agreed to collaborate to provide promotional support for the Promus PREMIER Stent System in hospitals in the United States. Under the terms of the co-promotion agreement, the Company's sales force began collaborating with the BSX Interventional Cardiology sales force in January 2014. Since inception, the Company has recognized $5.0 million in co-promotion income. The agreement was terminated effective December 31, 2014.