Revenue Recognition - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Total sales	$ 12,667	$ 11,959	$ 25,416	$ 25,921
Contract assets	643		643		$ 590
Contract liabilities	67		67		$ 113
Contract liabilities, revenue recognized			$ 100
Customer Concentration Risk | Revenue Benchmark | Largest Customer
Disaggregation of Revenue [Line Items]
Total gross profit margin (loss)			39.00%	10.00%
Non-US
Disaggregation of Revenue [Line Items]
Total sales	$ 900	$ 400	$ 1,300	$ 800