Collaborative Research Agreements - Additional Information (Detail) (USD $)	12 Months Ended				0 Months Ended	12 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Genta [Member]	Jun. 21, 2008 GLP-1 License Agreement [Member]	Dec. 31, 2013 GLP-1 License Agreement [Member]	May 06, 2013 GLP-1 License Agreement [Member]	Dec. 31, 2010 Insulins License Agreement [Member]	Dec. 31, 2013 Insulins License Agreement [Member]
Indefinite-lived Intangible Assets [Line Items]
Milestone and upfront payments to agreements	$ 10,000,000	$ 0	$ 0			$ 2,000,000
Expense of reimbursements	0	20,000	60,000
Expenses in research and development	0	0	0
Sales and development excess amount						87,000,000		57,500,000
Non-refundable license fee					10,000,000	10,000,000		5,000,000
Payment released to Emisphere by milestone						2,000,000
Initial upfront payment						10,000,000		5,000,000
Deferred revenue	41,616,000	31,614,000				23,600,000	10,000,000		5,000,000
Payment in support services						1,600,000
Excess amounts in milestone payments				$ 24,300,000