Revenue Recognition - Summary of Revenue from the Sale of Products and Services Under Contracts with Customers Excludes All Revenue Earned from Rental Contracts by Geographic Areas (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Total revenue	$ 9,083	$ 10,459
Operating Segments
Disaggregation Of Revenue [Line Items]
Total revenue	9,083	10,459
Operating Segments | Asia
Disaggregation Of Revenue [Line Items]
Total revenue	445	1,558
Operating Segments | Canada
Disaggregation Of Revenue [Line Items]
Total revenue	473	288
Operating Segments | Europe
Disaggregation Of Revenue [Line Items]
Total revenue	1,413	915
Operating Segments | United States
Disaggregation Of Revenue [Line Items]
Total revenue	6,597	6,610
Operating Segments | Other
Disaggregation Of Revenue [Line Items]
Total revenue	$ 155	$ 1,088