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Restructuring Costs - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Aug. 31, 2013 Employees	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Charges for employee termination benefits		$ 2.2us-gaap_SeveranceCosts1
Restructured of employees to conserve capital include a staff reduction of employees	47
Research and development [Member]
Restructuring Cost and Reserve [Line Items]
Charges for employee termination benefits		1.2
Charges for asset impairments		0.7
Manufacturing and production [Member]
Restructuring Cost and Reserve [Line Items]
Charges for employee termination benefits		0.5
General and administrative [Member]
Restructuring Cost and Reserve [Line Items]
Charges for employee termination benefits		$ 0.5

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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