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	9 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2020	Jun. 30, 2020	Jun. 30, 2019
Disaggregation Of Revenue [Line Items]
Total revenue	$ 6,975	$ 9,517	$ 9,083	$ 12,153	$ 18,600	$ 25,575	$ 34,457
Operating Segments
Disaggregation Of Revenue [Line Items]
Total revenue	6,975			12,153		25,575	34,457
Operating Segments | Asia
Disaggregation Of Revenue [Line Items]
Total revenue	925			1,094		2,200	4,162
Operating Segments | Canada
Disaggregation Of Revenue [Line Items]
Total revenue	509			1,202		1,776	1,832
Operating Segments | Europe
Disaggregation Of Revenue [Line Items]
Total revenue	1,193			1,023		3,865	3,108
Operating Segments | United States
Disaggregation Of Revenue [Line Items]
Total revenue	4,087			7,521		16,868	22,396
Operating Segments | Other
Disaggregation Of Revenue [Line Items]
Total revenue	$ 261			$ 1,313		$ 866	$ 2,959