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Secured Revolving Credit Facility - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended
Mar. 20, 2015
Feb. 29, 2016
Jan. 31, 2016
Dec. 31, 2015
Aug. 31, 2016
May. 31, 2016
Feb. 29, 2016
Aug. 31, 2015
Line of Credit Facility [Line Items]                
Expected monthly loss related to covenants               $ 500,000
Maximum amount of loss related to covenants               $ 1,000,000
Scenario Forecast [Member]                
Line of Credit Facility [Line Items]                
Expected monthly loss related to covenants   $ 1,000,000 $ 1,000,000 $ 1,500,000 $ 250,000 $ 500,000 $ 500,000  
Secured Revolving Credit Facility [Member]                
Line of Credit Facility [Line Items]                
Maximum borrowing capacity $ 10,000,000              
Credit facility, interest rate 3.75%              
Interest rate description               Loan advances bear interest at 3.75% in excess of The Wall Street Journal's published one year LIBOR rate
Secured revolving credit facility term 3 years              
Secured revolving credit facility renewal term 1 year              
Facility fee amount $ 150,000              
Annual facility fees $ 50,000              
Unused line fee payable in arrears per annum 0.25%              
Percentage of monthly bank assessment fees per annum 0.25%              
Overadvance fees per day $ 1,000              
Percentage of monthly letter of credit fees payable in arrears 0.25%              
Covenants limit on capital expenditures per year $ 600,000              
Unpaid balances interest rate 3.00%              
Secured Revolving Credit Facility [Member] | Scenario Forecast [Member]                
Line of Credit Facility [Line Items]                
Percentage of monthly bank assessment fees per annum       0.35%        
Covenants limit on capital expenditures per year       $ 800,000