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Credit Facility - Additional Information (Detail) - Revolving Line of Credit - USD ($)
Jul. 23, 2015
Dec. 31, 2015
Line of Credit Facility [Line Items]    
Line of credit, maximum borrowing capacity $ 5,500,000  
Line of credit facility, amount outstanding   $ 0
Prime Rate    
Line of Credit Facility [Line Items]    
Basis spread on variable interest rate 3.25%