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Revenue Recognition and Related Costs - Disaggregation of Company's Net Revenue by Major Source (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Net revenue	$ 30,654,000	$ 21,352,000	$ 50,760,000	$ 40,316,000
Equipment Sales [Member] | Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Net revenue	10,998,000	3,870,000	20,772,000	8,002,000
Equipment Sales [Member] | Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Net revenue	10,475,000	9,565,000	14,673,000	19,701,000
Parts and Component Sales [Member]
Disaggregation of Revenue [Line Items]
Net revenue	7,381,000	6,830,000	12,824,000	10,761,000
Freight Revenue [Member]
Disaggregation of Revenue [Line Items]
Net revenue	1,495,000	1,147,000	2,079,000	1,892,000
Other [Member]
Disaggregation of Revenue [Line Items]
Net revenue	$ 305,000	$ (60,000)	$ 412,000	$ (40,000)

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