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Revenue - Disaggregation of revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenue        
Revenue $ 52,276 $ 51,439 $ 155,328 $ 162,763
Percent of Total 100.00% 100.00% 100.00% 100.00%
Products and Licenses transferred at a point in time        
Revenue        
Revenue $ 28,193 $ 30,249 $ 85,016 $ 103,893
Services transferred over time        
Revenue        
Revenue 24,083 21,190 70,312 58,870
Europe, Middle East, Africa (EMEA) [Member]        
Revenue        
Revenue $ 21,965 $ 26,684 $ 73,784 $ 88,624
Percent of Total 42.00% 52.00% 48.00% 54.00%
Americas        
Revenue        
Revenue $ 17,621 $ 12,305 $ 51,160 $ 38,570
Percent of Total 34.00% 24.00% 32.00% 24.00%
Asia Pacific [Member]        
Revenue        
Revenue $ 12,690 $ 12,450 $ 30,384 $ 35,569
Percent of Total 24.00% 24.00% 20.00% 22.00%
Hardware products        
Revenue        
Revenue $ 17,908 $ 21,687 $ 55,027 $ 65,613
Software licenses        
Revenue        
Revenue 10,285 8,562 29,989 38,280
Subscription        
Revenue        
Revenue 10,197 7,446 28,426 19,286
Professional services        
Revenue        
Revenue 1,152 1,353 3,595 4,100
Maintenance, support and other        
Revenue        
Revenue $ 12,734 $ 12,391 $ 38,291 $ 35,484