Property and Equipment - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Property and Equipment
Total property and equipment	$ 243,827	$ 222,404
Less: accumulated depreciation and amortization	(92,883)	(81,148)
Total property and equipment, net	150,944	141,256
Capitalized internal-use software development costs
Property and Equipment
Total property and equipment	110,918	100,155
Data center equipment
Property and Equipment
Total property and equipment	22,018	22,009
Leasehold improvements
Property and Equipment
Total property and equipment	63,961	55,886
Office equipment
Property and Equipment
Total property and equipment	27,001	25,083
Furniture and fixtures
Property and Equipment
Total property and equipment	10,253	10,095
Software
Property and Equipment
Total property and equipment	$ 9,676	$ 9,176