Segment and Geographic Information - Summary of Revenue by Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Schedule Of Revenues From External Customers [Line Items]
Revenue	$ 89,253	$ 94,864
Africa
Schedule Of Revenues From External Customers [Line Items]
Revenue	471	2,507
Asia
Schedule Of Revenues From External Customers [Line Items]
Revenue	13,823	23,299
Canada
Schedule Of Revenues From External Customers [Line Items]
Revenue	1,225	997
Europe
Schedule Of Revenues From External Customers [Line Items]
Revenue	28,381	13,801
South America
Schedule Of Revenues From External Customers [Line Items]
Revenue	7,547	2,514
United States
Schedule Of Revenues From External Customers [Line Items]
Revenue	35,171	49,541
Other
Schedule Of Revenues From External Customers [Line Items]
Revenue	$ 2,635	$ 2,205