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Financings - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2016
Apr. 30, 2016
Apr. 30, 2015
Aug. 31, 2014
Financing Activities and Borrowing Arrangements [Line Items]        
Line of credit facility, maximum borrowing amount     $ 25,000,000 $ 25,000,000
Guaranteed borrowing capacity     $ 5,000,000  
Debt instrument maturity date Aug. 20, 2017      
Noncurrent Liability        
Financing Activities and Borrowing Arrangements [Line Items]        
Borrowings outstanding $ 23,200,000      
Subsequent Event        
Financing Activities and Borrowing Arrangements [Line Items]        
Line of credit facility, maximum borrowing amount   $ 27,000,000    
Line of credit facility sub limit additional borrowing capacity   2,000,000    
Guaranteed additional borrowing capacity   $ 7,000,000