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Lease Exit Liability - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Jul. 16, 2008
Restructuring Cost and Reserve [Line Items]
Operating Lease			2018
Onetime purchase payment under purchase agreement					$ 5,000,000
Incremental in-process research and development expense	0	0	0	0
Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Onetime payment paid under license of product					8,000,000
Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Onetime payment paid under license of product					$ 12,000,000