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Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Disaggregation of Revenue [Line Items]        
Total Revenue $ 73,447 $ 65,764 $ 135,764 $ 128,077
North America, primarily the United States        
Disaggregation of Revenue [Line Items]        
Total Revenue 57,374 48,869 104,910 95,204
Europe, Middle East & Africa        
Disaggregation of Revenue [Line Items]        
Total Revenue 9,885 10,764 18,401 20,868
Rest of world        
Disaggregation of Revenue [Line Items]        
Total Revenue 6,188 6,131 12,453 12,005
Transferred at a point in time        
Disaggregation of Revenue [Line Items]        
Total Revenue 66,765 60,725 123,065 118,188
Transferred over time        
Disaggregation of Revenue [Line Items]        
Total Revenue $ 6,682 $ 5,039 $ 12,699 $ 9,889