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Restructuring Actions - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2013 Position	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 4,800,000us-gaap_RestructuringCharges
Number of positions reduced	155
Employee separation costs		4,751,000us-gaap_SeveranceCosts1
Restructuring liability	2,200,000us-gaap_RestructuringReserveCurrent	2,200,000us-gaap_RestructuringReserveCurrent
Research and development expense
Restructuring Cost and Reserve [Line Items]
Employee separation costs	2,200,000
Selling, general and administrative expense
Restructuring Cost and Reserve [Line Items]
Employee separation costs	$ 2,600,000

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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- Definition

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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