Property and Equipment - Components of Property and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Property Plant And Equipment [Line Items]
Total	$ 125,946	$ 114,073
Less: accumulated depreciation and amortization	(64,193)	(51,342)
Property and equipment, net	61,753	62,731
Hosting equipment
Property Plant And Equipment [Line Items]
Total	37,413	35,018
Leasehold improvements
Property Plant And Equipment [Line Items]
Total	28,055	25,396
Capitalized internal-use software
Property Plant And Equipment [Line Items]
Total	27,938	25,773
Computer equipment and licensed software and patents
Property Plant And Equipment [Line Items]
Total	15,228	11,879
Furniture and fixtures
Property Plant And Equipment [Line Items]
Total	9,281	8,014
Construction in progress
Property Plant And Equipment [Line Items]
Total	$ 8,031	$ 7,993