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Contingencies - Additional Information (Detail) (USD $)
1 Months Ended
Feb. 24, 2011
Jun. 16, 2011
Securities Litigation
Feb. 24, 2011
Securities Litigation
Maximum
Feb. 08, 2012
Securities Litigation
Settlement of Litigation
Jun. 16, 2011
Securities Litigation
Insurance Company
Jun. 16, 2011
Securities Litigation
Income
Feb. 24, 2011
Securities Litigation
Mr. Therrien
Commitments and Contingencies Disclosure [Line Items]              
Proceeds from sale of shares             $ 1,900,000
Number of shares sold             150,000
Litigation settlement, disgorgement payment             728,000
Litigation settlement, fines             100,000
Percent of litigation settlement     30.00%   50.00% 50.00%  
Reimbursement to Mr. Therrien towards his disgorgement payment 500,000            
Proceeds from litigation settlement   1,300,000          
Net insurance proceeds       $ 3,500,000