Summary of Company's Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenue	$ 87,835	$ 95,809
Income (loss) from operations	(18,039)	1,033
Depreciation and amortization expenses	23,693	19,339
Impairment, inventory obsolescence and stock-based compensation expenses	7,702	6,943
Interest income	1,102	1,308
Interest expense	38	99
Operating Segments | Oil and Gas Markets
Segment Reporting Information [Line Items]
Revenue	61,661	64,966
Income (loss) from operations	(2,139)	3,095
Depreciation and amortization expenses	21,192	16,865
Impairment, inventory obsolescence and stock-based compensation expenses	6,326	6,046
Interest income	1,029	1,033
Operating Segments | Adjacent Markets Product and Services Revenue
Segment Reporting Information [Line Items]
Revenue	25,440	30,156
Income (loss) from operations	4,017	6,234
Depreciation and amortization expenses	453	466
Impairment, inventory obsolescence and stock-based compensation expenses	232	92
Interest income	3	1
Operating Segments | Emerging Markets Product and Services Revenue
Segment Reporting Information [Line Items]
Revenue	734	159
Income (loss) from operations	(6,064)	(2,306)
Depreciation and amortization expenses	1,194	1,164
Impairment, inventory obsolescence and stock-based compensation expenses	203	68
Corporate
Segment Reporting Information [Line Items]
Revenue		528
Income (loss) from operations	(13,853)	(5,990)
Depreciation and amortization expenses	854	844
Impairment, inventory obsolescence and stock-based compensation expenses	941	737
Interest income	70	274
Interest expense	$ 38	$ 99