Property and Equipment, Net - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 41,265	$ 23,539	$ 11,568
Capitalized internal use software costs	31,700	17,400	11,500
Capitalized computer software additions, related to payroll costs	24,700	13,600	7,900
Incurred interest	84,200	26,600	8,600
Capitalized interest	3,600	1,600	900
Selling, general and administrative
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 39,600	$ 22,500	$ 11,600