Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Business combination, goodwill	$ 10,000,000	$ 10,000,000
Impairment of indefinite-lived intangible assets	0
Impairment of goodwill	$ 0
CureTech Ltd [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Business combination, identifiable intangible asset		101,000,000
Business combination, goodwill		$ 10,000,000