Annual report pursuant to Section 13 and 15(d)

Property and Equipment, Net - Additional Information (Detail)

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Property and Equipment, Net - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Abstract]    
Fully depreciated computer software and hardware equipment and furniture, fixtures and equipment write-off $ 1.4 $ 2.9