Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Total Revenue	$ 77,301	$ 73,447	$ 150,447	$ 135,764
North America, primarily the United States
Disaggregation of Revenue [Line Items]
Total Revenue	56,423	57,374	110,441	104,910
Europe, Middle East & Africa
Disaggregation of Revenue [Line Items]
Total Revenue	11,690	9,885	22,226	18,401
Rest of world
Disaggregation of Revenue [Line Items]
Total Revenue	9,188	6,188	17,780	12,453
Transferred at a point in time
Disaggregation of Revenue [Line Items]
Total Revenue	69,144	66,765	133,332	123,065
Transferred over time
Disaggregation of Revenue [Line Items]
Total Revenue	$ 8,157	$ 6,682	$ 17,115	$ 12,699