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Secured Revolving Credit Facility - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 20, 2015
Dec. 31, 2016
Jul. 31, 2016
Jun. 30, 2016
Aug. 31, 2016
May 31, 2017
Line of Credit Facility [Line Items]            
Expected monthly net loss related to covenants     $ 1,000,000 $ 500,000    
Scenario Forecast [Member]            
Line of Credit Facility [Line Items]            
Expected monthly net loss related to covenants   $ 1,000,000       $ 250,000
Scenario Forecast [Member] | Increased From [Member]            
Line of Credit Facility [Line Items]            
Covenants limit on capital expenditures per year           800,000
Scenario Forecast [Member] | Increased To [Member]            
Line of Credit Facility [Line Items]            
Covenants limit on capital expenditures per year           $ 1,500,000
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