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Restructuring - Summarizes Restructuring Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 14us-gaap_RestructuringCharges	$ 764us-gaap_RestructuringCharges	$ 185us-gaap_RestructuringCharges
Research and Development Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	14	414	69
General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense		$ 350	$ 116

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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