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Revenue - Disaggregation of revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenue    
Revenue $ 50,775 $ 56,370
Percent of Total 100.00% 100.00%
Products and Licenses transferred at a point in time    
Revenue    
Revenue $ 28,445 $ 38,260
Services transferred over time    
Revenue    
Revenue 22,330 18,110
EMEA    
Revenue    
Revenue $ 26,989 $ 33,604
Percent of Total 53.00% 59.00%
Americas    
Revenue    
Revenue $ 16,528 $ 12,333
Percent of Total 33.00% 22.00%
APAC    
Revenue    
Revenue $ 7,258 $ 10,433
Percent of Total 14.00% 19.00%
Hardware products    
Revenue    
Revenue $ 17,668 $ 19,738
Software licenses    
Revenue    
Revenue 10,777 18,522
Subscription    
Revenue    
Revenue 8,405 5,707
Professional services    
Revenue    
Revenue 1,402 1,421
Maintenance, support and other    
Revenue    
Revenue $ 12,523 $ 10,982