Intangible Assets - Additional Information (Detail) (USD $)			3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Ceregene, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Excess of consideration transferred over the fair values assigned to assets acquired and liabilities assumed	$ 1,585,000	$ 1,585,000	$ 1,600,000
Changes in the Goodwill			$ 0