Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Total Revenue	$ 62,317	$ 62,313
North America, primarily the United States
Disaggregation of Revenue [Line Items]
Total Revenue	47,536	46,335
Europe, Middle East & Africa
Disaggregation of Revenue [Line Items]
Total Revenue	8,516	10,104
Rest of world
Disaggregation of Revenue [Line Items]
Total Revenue	6,265	5,874
Transferred at a point in time
Disaggregation of Revenue [Line Items]
Total Revenue	56,300	57,463
Transferred over time
Disaggregation of Revenue [Line Items]
Total Revenue	$ 6,017	$ 4,850