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Revenue - Disaggregation of revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Revenue        
Revenue $ 51,439 $ 79,691 $ 162,763 $ 182,953
Percent of Total 100.00% 100.00% 100.00% 100.00%
Products and Licenses transferred at a point in time        
Revenue        
Revenue $ 30,249 $ 61,215 $ 103,893 $ 132,675
Services transferred over time        
Revenue        
Revenue 21,190 18,476 58,870 50,278
EMEA        
Revenue        
Revenue $ 26,684 $ 48,694 $ 88,624 $ 107,554
Percent of Total 52.00% 61.00% 54.00% 59.00%
Americas        
Revenue        
Revenue $ 12,305 $ 15,605 $ 38,570 $ 42,762
Percent of Total 24.00% 20.00% 24.00% 23.00%
APAC        
Revenue        
Revenue $ 12,450 $ 15,392 $ 35,569 $ 32,637
Percent of Total 24.00% 19.00% 22.00% 18.00%
Hardware products        
Revenue        
Revenue $ 21,687 $ 42,027 $ 65,613 $ 95,356
Software licenses        
Revenue        
Revenue 8,562 19,188 38,280 37,319
Subscription        
Revenue        
Revenue 7,446 5,556 19,286 16,163
Professional services        
Revenue        
Revenue 1,353 2,338 4,100 3,995
Maintenance, support and other        
Revenue        
Revenue $ 12,391 $ 10,582 $ 35,484 $ 30,120