Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 29,918	$ 26,261
Less: Accumulated depreciation and amortization	(17,091)	(12,774)
Property and equipment, net	12,827	13,487
Computer and Office Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	15,740	14,253
Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	3,631	2,485
Furniture
Property Plant And Equipment [Line Items]
Property and equipment, gross	1,561	1,278
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 8,986	$ 8,245