Summary of Revenue by Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Schedule Of Revenues From External Customers [Line Items]
Revenue	$ 94,864	$ 87,835
Africa
Schedule Of Revenues From External Customers [Line Items]
Revenue	2,507	5,814
Asia
Schedule Of Revenues From External Customers [Line Items]
Revenue	23,299	41,128
Canada
Schedule Of Revenues From External Customers [Line Items]
Revenue	997	3,193
Europe
Schedule Of Revenues From External Customers [Line Items]
Revenue	13,801	12,626
United States
Schedule Of Revenues From External Customers [Line Items]
Revenue	49,541	23,780
Other
Schedule Of Revenues From External Customers [Line Items]
Revenue	$ 4,719	$ 1,294