Revenue - Revenue by Services (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 66,775	$ 65,275	$ 145,639	$ 125,579
SaaS subscriptions
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	29,580	22,796	57,970	44,074
Term license subscriptions
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	7,379	10,103	25,172	19,660
Maintenance and support
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	4,459	3,961	8,712	7,683
Professional services
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 25,357	$ 28,415	$ 53,785	$ 54,162