Property and Equipment, Net - Summary of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property Plant and Equipment [Line Items]
Property and equipment at cost	$ 61,432	$ 48,185
Less: Accumulated depreciation	(17,627)	(10,673)
Property and equipment, net	43,805	37,512
Land
Property Plant and Equipment [Line Items]
Property and equipment at cost	543	940
Equipment
Property Plant and Equipment [Line Items]
Property and equipment at cost	10,094	8,218
Furniture, fixtures, and leasehold improvements
Property Plant and Equipment [Line Items]
Property and equipment at cost	15,415	8,563
Computer hardware, software, and phone equipment
Property Plant and Equipment [Line Items]
Property and equipment at cost	7,535	4,569
Buildings
Property Plant and Equipment [Line Items]
Property and equipment at cost	2,253	2,839
Deemed assets from landlord building construction
Property Plant and Equipment [Line Items]
Property and equipment at cost	22,752	22,752
Construction-in-Progress
Property Plant and Equipment [Line Items]
Property and equipment at cost	$ 2,840	$ 304