Business Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2022	Mar. 31, 2023	Sep. 17, 2021	Mar. 31, 2021	Dec. 06, 2018
Business Acquisition [Line Items]
Goodwill	$ 24,510	$ 0		$ 0
VAY AG
Business Acquisition [Line Items]
Cash	867		$ 230
Measurement period adjustments, cash	637
Accounts receivable	9		9
Measurement period adjustments, accounts receivable	0
Prepaid expenses	13		15
Measurement period adjustments, prepaid expenses	(2)
Deferred tax assets	59		58
Measurement period adjustments, deferred tax assets	1
Developed technology (included in property, plant and equipment)	3,000		3,000
Measurement period adjustments, developed technology (included in property, plant and equipment	0
Identifiable assets acquired	3,948		3,312
Measurement period adjustments, identifiable assets acquired	636
Accrued liabilities	909		187
Measurement period adjustments, accrued liabilities	722
Unearned revenue	56		53
Measurement period adjustments, unearned revenue	3
Deferred tax liabilities, non-current	591		591
Measurement period adjustments, deferred tax liabilities, non-current	0
Total liabilities assumed	1,556		831
Measurement period adjustments, total liabilities assumed	725
Net identifiable assets acquired	2,392		2,481
Measurement period adjustments, net identifiable assets acquired	(89)
Goodwill	24,510		24,508		$ 24,500
Measurement period adjustments, goodwill	2
Total assets acquired	26,902		$ 26,989
Measurement period adjustments, total assets acquired	$ (87)