License and Collaborative Agreements	12 Months Ended
Dec. 31, 2011
License and Collaborative Agreements [Abstract]
License and Collaborative Agreements	11. License and Collaborative Agreements Muscular Dystrophy Association On December 12, 2007, we announced that we were awarded a grant of $2.1 million from the Muscular Dystrophy Association for our Phase 3 enabling clinical trial of IPLEX in the Myotonic Muscular Dystrophy indication. We received half of the $2.1 million milestone payments in 2008 and the remaining half in 2009. NAPO In 2007, we entered into an agreement with NAPO Pharmaceuticals, whereby NAPO will license from us the technology surrounding INSM-18 also known as Masoprocal. The license gives NAPO the right to develop, manufacture and commercialize Masoprocal products for any indications relating specifically to diabetes, cardiac disease, vascular disease, metabolic disease and Syndrome X. The agreement calls for payments from NAPO to us upon the achievement of certain milestones which have not yet been met. Cystic Fibrosis Foundation Therapeutics, Inc. In 2009 and 2005, the Company entered into a research funding agreements with Cystic Fibrosis Foundation Therapeutics, Inc. (CFFT) where the Company received $2.2 million and $1.7 million for each respective agreement in research funding for the development of its ARIKACE product. If ARIKACE becomes an approved product in the United States, the Company will owe a “royalty payment” to CFFT of up to $13.4 million that is payable over a three-year period after approval as a commercialized drug in the United States. Furthermore, if certain sales milestones are meet within 5 years of the drug commercialization approval in the United States, the Company would owe an additional $3.9 million in additional “royalty payment.” Since there is significant development risk associated with ARIKACE, the Company has not accrued the royalty obligations. TriAct On December 20, 2010, we entered into an agreement with TriAct Therapeutics Inc. (“TriAct”) TriAct obtained an exclusive license from Insmed for INS-18 also known as Masoprocal. The license gives TriAct the right to develop, manufacture and commercialize Masoprocal products for any indications relating specifically to Oncology. The agreement calls for the issue of TriAct common stock to Insmed upon the achievement of certain milestones. To date, no common stock has been received nor milestones achieved. Eleison On February 1, 2011, we entered into an agreement with Eleison Pharmaceuticals whereby Eleison obtained an exclusive license from Insmed for Inhaled CISPLATIN Lipid Complex. The license gives Eleison the right to develop, manufacture and commercialize inhaled CISPLATIN Lipid Complex for cancers affecting the lung. Payments were received in 2011 and are recorded in license fees. PARI Pharma GmbH In April 2008, we entered into a licensing agreement with PARI Pharma GmbH for use of the optimized, investigational eFlow Nebulizer System for delivery of ARIKACE in treating patients with CF, bronchiectasis, and non-tuberculosis mycobacterial infections. Insmed has rights to several U.S. and foreign issued patents, and there are future patent applications involving improvements to the optimized, investigational eFlow Nebulizer System. In consideration of this agreement, PARI shall receive payments either in cash, qualified stock or a combination of both, at PARI's discretion, based on achievement of certain milestone events including Phase 3 trial initiation, NDA acceptance and regulatory approval of ARIKACE together with royalty payments on commercial sales of ARIKACE.

11. License and Collaborative Agreements

Muscular Dystrophy Association

On December 12, 2007, we announced that we were awarded a grant of $2.1 million from the Muscular Dystrophy Association for our Phase 3 enabling clinical trial of IPLEX in the Myotonic Muscular Dystrophy indication. We received half of the $2.1 million milestone payments in 2008 and the remaining half in 2009.

NAPO

In 2007, we entered into an agreement with NAPO Pharmaceuticals, whereby NAPO will license from us the technology surrounding INSM-18 also known as Masoprocal. The license gives NAPO the right to develop, manufacture and commercialize Masoprocal products for any indications relating specifically to diabetes, cardiac disease, vascular disease, metabolic disease and Syndrome X. The agreement calls for payments from NAPO to us upon the achievement of certain milestones which have not yet been met.

Cystic Fibrosis Foundation Therapeutics, Inc.

In 2009 and 2005, the Company entered into a research funding agreements with Cystic Fibrosis Foundation Therapeutics, Inc. (CFFT) where the Company received $2.2 million and $1.7 million for each respective agreement in research funding for the development of its ARIKACE product. If ARIKACE becomes an approved product in the United States, the Company will owe a “royalty payment” to CFFT of up to $13.4 million that is payable over a three-year period after approval as a commercialized drug in the United States. Furthermore, if certain sales milestones are meet within 5 years of the drug commercialization approval in the United States, the Company would owe an additional $3.9 million in additional “royalty payment.” Since there is significant development risk associated with ARIKACE, the Company has not accrued the royalty obligations.

TriAct

On December 20, 2010, we entered into an agreement with TriAct Therapeutics Inc. (“TriAct”) TriAct obtained an exclusive license from Insmed for INS-18 also known as Masoprocal. The license gives TriAct the right to develop, manufacture and commercialize Masoprocal products for any indications relating specifically to Oncology. The agreement calls for the issue of TriAct common stock to Insmed upon the achievement of certain milestones. To date, no common stock has been received nor milestones achieved.

Eleison

On February 1, 2011, we entered into an agreement with Eleison Pharmaceuticals whereby Eleison obtained an exclusive license from Insmed for Inhaled CISPLATIN Lipid Complex. The license gives Eleison the right to develop, manufacture and commercialize inhaled CISPLATIN Lipid Complex for cancers affecting the lung. Payments were received in 2011 and are recorded in license fees.

PARI Pharma GmbH

In April 2008, we entered into a licensing agreement with PARI Pharma GmbH for use of the optimized, investigational eFlow Nebulizer System for delivery of ARIKACE in treating patients with CF, bronchiectasis, and non-tuberculosis mycobacterial infections. Insmed has rights to several U.S. and foreign issued patents, and there are future patent applications involving improvements to the optimized, investigational eFlow Nebulizer System. In consideration of this agreement, PARI shall receive payments either in cash, qualified stock or a combination of both, at PARI's discretion, based on achievement of certain milestone events including Phase 3 trial initiation, NDA acceptance and regulatory approval of ARIKACE together with royalty payments on commercial sales of ARIKACE.