Property and Equipment - Components of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Property Plant And Equipment [Line Items]
Total	$ 127,677	$ 114,073
Less: accumulated depreciation and amortization	(68,077)	(51,342)
Property and equipment, net	59,600	62,731
Hosting equipment
Property Plant And Equipment [Line Items]
Total	37,423	35,018
Capitalized internal-use software
Property Plant And Equipment [Line Items]
Total	30,449	25,773
Leasehold improvements
Property Plant And Equipment [Line Items]
Total	28,117	25,396
Computer equipment and licensed software and patents
Property Plant And Equipment [Line Items]
Total	15,122	11,879
Furniture and fixtures
Property Plant And Equipment [Line Items]
Total	9,496	8,014
Construction in progress
Property Plant And Equipment [Line Items]
Total	$ 7,070	$ 7,993