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Secured Revolving Credit Facility - Additional Information (Detail) - USD ($)
1 Months Ended 6 Months Ended
Mar. 20, 2015
Nov. 30, 2016
Nov. 30, 2016
Line of Credit Facility [Line Items]      
Expected monthly net loss related to covenants   $ 250,000  
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