Goodwill and Intangible Assets, Net - Schedule of Changes in the Carrying Value of Goodwill, IPR&D and Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended	12 Months Ended
	Aug. 31, 2013	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible assets			$ 1,845	$ 2,165	$ 2,485	$ 2,805
IPR&D			6,200	7,010	7,010	7,010
Goodwill			3,605	3,605	3,605	3,605
Amortization			(320)	(320)	(320)
Impairment	$ (810,000)	$ 0	$ (810)