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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