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, 2018	Dec. 31, 2017
Disaggregation Of Revenue [Line Items]
Total revenue	$ 10,459	$ 13,274
Operating Segments
Disaggregation Of Revenue [Line Items]
Total revenue	10,459	13,274
Operating Segments | Asia
Disaggregation Of Revenue [Line Items]
Total revenue	1,558	1,006
Operating Segments | Canada
Disaggregation Of Revenue [Line Items]
Total revenue	288	365
Operating Segments | Europe
Disaggregation Of Revenue [Line Items]
Total revenue	915	3,419
Operating Segments | United States
Disaggregation Of Revenue [Line Items]
Total revenue	6,610	8,023
Operating Segments | Other
Disaggregation Of Revenue [Line Items]
Total revenue	$ 1,088	$ 461