Fair Value Disclosures - Schedule of Undiscounted Amount of Contingent Consideration (Detail) (CureTech Ltd [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Business Acquisition, Contingent Consideration [Line Items]
Potential payment upon completion of Manufacturing Technology Transfer	$ 5,000
Minimum [Member]
Business Acquisition, Contingent Consideration [Line Items]
Potential future tiered royalties on annual worldwide net sales	5.00%
Maximum [Member]
Business Acquisition, Contingent Consideration [Line Items]
Potential future tiered royalties on annual worldwide net sales	11.00%
Sales milestones earned [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business acquisition maximum contingent consideration	245,000
Development milestones earned [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business acquisition maximum contingent consideration	$ 85,000