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Related Party Transactions - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Related Party Transaction [Line Items]
Receivables from related parties	$ 394,000	$ 57,000
Master Services Agreement
Related Party Transaction [Line Items]
Reduction in research and development expense	$ 816,000	$ 57,000

The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle).

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