Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 17,052	$ 15,228
Less accumulated depreciation and amortization	(10,909)	(8,985)
Property and equipment, net	6,143	6,243
Computer equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	1,207	960
Capitalized software
Property Plant And Equipment [Line Items]
Property and equipment, gross	1,569	865
Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	6,747	5,874
Leasehold improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 7,529	$ 7,529