Commitments and Contingencies (Details) (USD $)	1 Months Ended			6 Months Ended	1 Months Ended				0 Months Ended	12 Months Ended
	Oct. 31, 2011	Sep. 30, 2011 Item	Aug. 31, 2008 Item	Jun. 30, 2013 Item	Apr. 30, 2010 West Kendall Sublease Item	Sep. 30, 2004 West Kendall Sublease sqft	May 01, 2011 West Kendall Sublease	Nov. 30, 2005 West Kendall Sublease sqft	Feb. 05, 2013 320 Bent Sublease Item sqft	Dec. 31, 2011 320 Bent Sublease sqft
Operating leases disclosures
Square feet of office and laboratory space leased						53,323		25,131	104,678	68,575
Initial lease term						80 months				18 months
2013									$ 6,100,000
2014				10,937,000					6,200,000
2015				7,870,000					6,300,000
Security deposit to be provided in cash or in the form of a letter of credit									700,000
Tenant improvement allowance									700,000
Number of times for which extension of lease term is available					1				2
Extended lease term					48 months				1 year
Increase in annual lease payments during the extension term							1,200,000
Annual rental payments due under the sublease										2,300,000
Additional number of times extension of lease term is available									2
Additional extended lease term									5 years
Operating lease commitments
July 1, 2013 - December 31, 2013				5,047,000
2014				10,937,000					6,200,000
2015				7,870,000					6,300,000
2016				4,273,000
2017				62,000
Total future minimum lease payments				28,189,000
Legal Contingencies
Damages sought value				0
Orange Book patents listed for Copaxone			7
Additional Number of patents infringed			2
Non Orange Book patent				2
Number of patents infringed		2	4
Amount of security bond required to be posted by company and Sandoz in connection with the litigation	100,000,000
Maximum amount of security bond for which the entity shall be responsible in the event of loss of case				$ 35,000,000