Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Total Revenue	$ 70,338	$ 61,166	$ 206,102	$ 189,243
North America, primarily the United States
Disaggregation of Revenue [Line Items]
Total Revenue	52,603	43,604	157,513	138,808
Europe, Middle East & Africa
Disaggregation of Revenue [Line Items]
Total Revenue	11,027	9,582	29,428	30,450
Rest of world
Disaggregation of Revenue [Line Items]
Total Revenue	6,708	7,980	19,161	19,985
Transferred at a point in time
Disaggregation of Revenue [Line Items]
Total Revenue	63,674	54,452	186,739	172,640
Transferred over time
Disaggregation of Revenue [Line Items]
Total Revenue	$ 6,664	$ 6,714	$ 19,363	$ 16,603