Segment and Disaggregated Revenue Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) person item	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of business activities | item	1
Number of segment managers | person	0
Property and equipment—net	$ 4,804	$ 7,046
Revenue	205,236	193,192	$ 179,758
Recurring revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	172,948	151,148	128,577
Cloud subscriptions
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	67,034	50,714	38,728
On-premise subscriptions - point-in-time
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	22,022	20,948	15,994
On-premise subscriptions - ratable
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	18,909	16,275	14,779
Software support on perpetual licenses- ratable
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	64,983	63,211	59,076
Non-recurring revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	32,288	42,044	51,181
Perpetual license - point-in-time
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	27,447	38,390	48,041
Professional services - point-in-time
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	4,841	3,654	3,140
India | Net Property and Equipment | Geographic
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment—net	$ 2,000	$ 2,500
Concentration risk, percentage	42.00%	35.00%
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 86,715	$ 82,033	83,625
International
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 118,521	$ 111,159	$ 96,133
Germany | Total revenue | Geographic
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	16.00%	16.00%	13.00%
Revenue	$ 32,700	$ 30,700	$ 22,600