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Accounts Payable and Accrued Expenses - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012 Employee
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 300,000
Cash severance payments	$ 62,000	$ 88,000
Restructuring plan, reduction in force of employees		18

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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