Other Assets - Additional Information (Detail) (USD $)	3 Months Ended				3 Months Ended		12 Months Ended		3 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 CeloNova BioSciences, Inc. [Member] Maximum [Member]	Dec. 31, 2013 ThermopeutiX, Inc. [Member] Maximum [Member]	Dec. 31, 2013 ViaCyte, Inc. [Member]	Mar. 31, 2013 ViaCyte, Inc. [Member]	Sep. 30, 2006 ViaCyte, Inc. [Member]	Dec. 31, 2013 ViaCyte, Inc. [Member] Maximum [Member]	Dec. 31, 2013 Vessix Vascular, Inc. [Member]	Dec. 31, 2013 Investment In Vessix Vascular, Inc. [Member]	Dec. 31, 2012 Investment In Vessix Vascular, Inc. [Member]	Sep. 30, 2010 Investment In Vessix Vascular, Inc. [Member]	Dec. 31, 2013 Investment In Vessix Vascular, Inc. [Member] Maximum [Member]
Schedule of Investments [Line Items]
Company's ownership percentage			2.00%	20.00%				1.00%
Impairment loss on investment					$ 5,300,000	$ 100,000	$ 4,700,000		$ 1,200,000	$ 2,500,000		$ 2,400,000
Cost method of investment					500,000
Gain on sale of investment	681,000	1,174,000									1,200,000
Clinical milestone payment to be received										700,000
Potential proceeds on achievement of future milestones													3,500,000
Revenue recognized from activity with companies in which it had strategic investment	$ 100,000	$ 100,000