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Property and Equipment - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Property Plant And Equipment [Abstract]        
Depreciation and amortization expense $ 762,000 $ 885,000 $ 2,400,000 $ 2,600,000