Property and Equipment, Net - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 7,943	$ 4,605
Property, Plant and Equipment
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 7,600	$ 4,600