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		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Disaggregation Of Revenue [Line Items]
Total revenue	$ 9,517	$ 11,845	$ 18,600	$ 22,304
Operating Segments
Disaggregation Of Revenue [Line Items]
Total revenue	9,517	11,845	18,600	22,304
Operating Segments | Asia
Disaggregation Of Revenue [Line Items]
Total revenue	830	1,510	1,275	3,068
Operating Segments | Canada
Disaggregation Of Revenue [Line Items]
Total revenue	794	342	1,267	630
Operating Segments | Europe
Disaggregation Of Revenue [Line Items]
Total revenue	1,259	1,170	2,672	2,085
Operating Segments | United States
Disaggregation Of Revenue [Line Items]
Total revenue	6,184	8,265	12,781	14,875
Operating Segments | Other
Disaggregation Of Revenue [Line Items]
Total revenue	$ 450	$ 558	$ 605	$ 1,646