Property and Equipment, Net - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense	$ 2,600	$ 1,000	$ 4,645	$ 1,824
Capitalized internal use software costs	5,400	1,900	5,400	1,900
Capitalized computer software additions	$ 1,900	$ 900	$ 3,600	$ 1,400