Meda License, Development and Supply Agreements - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended				1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	12 Months Ended		1 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 ONSOLIS[Member]	Jun. 30, 2012 ONSOLIS[Member]	Oct. 31, 2009 US [Member]	Jun. 30, 2013 US [Member]	Oct. 31, 2012 EU [Member]	Jun. 30, 2013 EU [Member]	Dec. 31, 2012 EU [Member]	Jun. 30, 2013 Milestones [Member] EU [Member]	Oct. 31, 2012 Meda License Development and Supply Agreement [Member] EU [Member]	May 31, 2012 Meda License Development and Supply Agreement [Member] EU [Member] ONSOLIS[Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Aggregate milestones and services revenue recognized	$ 1,908,949	$ 16,297,972	$ 3,530,926	$ 32,802,137			$ 59,700,000		$ 17,500,000				$ 2,500,000	$ 2,500,000
Remaining deferred revenue related to the EU Media arrangement milestones												1,400,000
Additional revenues in milestones											5,000,000
Estimated portion of upfront payments								1,310,000		60,000
Product royalty revenues	855,101		855,101		900,000	0
Cost of product royalties	$ 690,207	$ 375,000	$ 1,065,207	$ 750,000	$ 1,100,000	$ 800,000
Shelf life of the product			24 months