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Property and Equipment - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Abstract]      
Depreciation and amortization expense relative to property and equipment $ 2.5 $ 2.3 $ 4.0
Cost of products sold and services provided $ 0.7 $ 0.7 $ 2.8