Segment and Disaggregated Revenue Information (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020 USD ($) segment person	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of business activities | segment	1
Number of segment managers | person	0
Property and equipment—net	$ 4,066		$ 4,804
Revenue	49,698	$ 48,082
Recurring revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	42,920	39,781
Cloud services
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	18,634	15,261
On-premise subscriptions - point-in-time
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	3,378	3,952
On-premise subscriptions - ratable
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	4,922	4,458
Software support on perpetual licenses- ratable
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	15,986	16,110
Non-recurring revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	6,778	8,301
Perpetual license - point-in-time
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	5,633	7,419
Professional services - point-in-time
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	1,145	882
India | Net Property and Equipment | Geographic
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment—net	$ 1,800		$ 2,000
Concentration risk, percentage	43.00%		42.00%
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 21,133	19,612
International
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 28,565	$ 28,470
Germany | Total revenue | Geographic
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	15.00%	16.00%
Revenue	$ 7,200	$ 7,700