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Restructuring - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Oct. 31, 2013	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Percentage of reduction in global work force	50.00%
Charges for severance and related benefits		$ 2.8
Expected additional restructuring charges		0
Research and Development
Restructuring Cost and Reserve [Line Items]
Charges for severance and related benefits		0.2
Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Charges for severance and related benefits		$ 2.6

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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