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Revenue - Disaggregation of revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenue                      
Revenue $ 59,153 $ 52,276 $ 52,277 $ 50,775 $ 52,928 $ 51,439 $ 54,954 $ 56,370 $ 214,481 $ 215,691 $ 253,484
Percent of Total                 100.00% 100.00% 100.00%
Products and Licenses transferred at a point in time                      
Revenue                      
Revenue                 $ 120,358 $ 132,986 $ 183,313
Services transferred over time                      
Revenue                      
Revenue                 94,123 82,705 70,171
Europe, Middle East, Africa (EMEA) [Member]                      
Revenue                      
Revenue                 $ 104,878 $ 117,086 $ 145,942
Percent of Total                 49.00% 54.00% 58.00%
Americas                      
Revenue                      
Revenue                 $ 68,646 $ 53,171 $ 61,577
Percent of Total                 32.00% 25.00% 24.00%
Asia Pacific [Member]                      
Revenue                      
Revenue                 $ 40,957 $ 45,434 $ 45,965
Percent of Total                 19.00% 21.00% 18.00%
Hardware products                      
Revenue                      
Revenue                 $ 79,501 $ 81,849 $ 127,005
Software licenses                      
Revenue                      
Revenue                 40,857 51,137 56,308
Subscription                      
Revenue                      
Revenue                 38,213 27,788 22,280
Professional services                      
Revenue                      
Revenue                 4,634 5,689 5,759
Maintenance, support and other                      
Revenue                      
Revenue                 $ 51,276 $ 49,228 $ 42,132