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Restructuring Charges - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Restructuring charge	$ 1.1
Research and development
Restructuring Cost and Reserve [Line Items]
Restructuring charge	0.9
General and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring charge	$ 0.2

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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