Details of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	$ 87,835	$ 95,809
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	82,166	91,222
Canada
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	3,709	5,266
Colombia
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	5	408
Russian Federation
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	2,668	4,286
United Kingdom
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	2,488	2,905
Eliminations
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	$ (3,201)	$ (8,278)