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Revolving Credit Facility - Additional Information (Detail) - Revolving Credit Facility [Member] - London Interbank Offered Rate (LIBOR) [Member] - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2010
Line of Credit Facility [Line Items]      
Maximum borrowing capacity     $ 7,500,000
Outstanding credit facility $ 0 $ 0