Annual report pursuant to Section 13 and 15(d)

Property and Equipment - Additional Information (Detail)

v3.19.1
Property and Equipment - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Depreciation $ 1,393 $ 726