Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Business combination, goodwill	$ 10,000,000	$ 10,000,000	$ 10,000,000
CureTech Ltd [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Business combination, identifiable intangible asset			101,000,000
Business combination, goodwill			$ 10,000,000
Changes to carrying value of goodwill	0	0
Changes to carrying value of indefinite-lived intangible assets	$ 0	$ 0