Property and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense relative to property and equipment	$ 4,900	$ 3,400	$ 2,500
Cost of products sold and services provided	161,485	136,710	97,709
Property, Plant and Equipment
Property, Plant and Equipment [Line Items]
Cost of products sold and services provided	$ 1,400	$ 1,100	$ 700