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Credit Facility - Additional Information (Detail) - Revolving Credit Facility - USD ($)
12 Months Ended
Mar. 05, 2013
Dec. 31, 2015
Line Of Credit Facility [Line Items]    
Credit facility, initiation date   Mar. 05, 2013
Credit facility, maximum borrowing capacity $ 15,000,000  
Credit facility, maturity term 3 years  
Revolving credit facility outstanding   $ 0
LIBOR    
Line Of Credit Facility [Line Items]    
Credit facility, interest rate 3.25%