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Business - Additional Information (Detail) (USD $) In Millions, unless otherwise specified		1 Months Ended
	Jun. 30, 2012	Jul. 16, 2012 Subsequent Event Severance and Health Benefit Continuation Costs
Nature Of Business [Line Items]
Accumulated deficit	$ 235.7
Restructuring charge		$ 1.1

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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