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Segment and Disaggregated Revenue Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
segment
person
Sep. 30, 2018
USD ($)
Dec. 31, 2018
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 $ 5,529   $ 5,529   $ 7,046
Revenue 52,201 $ 49,251 151,148 $ 139,069  
Recurring revenue          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenue 44,820 39,670 129,098 110,381  
Cloud services          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenue 17,591 13,199 49,163 36,181  
On-premise subscriptions - point-in-time          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenue 5,964 6,337 17,394 15,332  
On-premise subscriptions - ratable          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenue 4,902 4,121 13,872 11,956  
Software support on perpetual licenses- ratable          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenue 16,363 16,013 48,669 46,912  
Non-recurring revenue          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenue 7,381 9,581 22,050 28,688  
Perpetual license - point-in-time          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenue 6,252 8,669 18,420 25,995  
Professional services - point-in-time          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenue 1,129 912 3,630 2,693  
India | Net Property and Equipment | Geographic          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Property and equipment-net 2,200   $ 2,200   $ 2,500
Concentration risk, percentage     40.00%   35.00%
United States          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenue 23,376 21,654 $ 64,849 61,061  
International          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenue $ 28,825 $ 27,597 $ 86,299 $ 78,008  
Germany | Total revenue | Geographic          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Concentration risk, percentage 14.00% 17.00% 15.00% 16.00%  
Revenue $ 7,300 $ 8,600 $ 23,400 $ 22,800