Revenue Recognition - Additional Information (Details)	12 Months Ended
	Sep. 30, 2022 USD ($) Customer	Sep. 30, 2021 USD ($) Customer	Sep. 30, 2020 USD ($) Customer
Disaggregation Of Revenue [Line Items]
Total revenues	$ 327,891,000	$ 387,182,000	$ 330,967,000
Minimum commitment deals of revenue	$ 47,100,000
Distribution period	5 years
Contract acquisition costs	$ 8,300,000	6,900,000
Contract acquisition cost, amortization	2,500,000	1,900,000	1,500,000
Contract acquisition cost, impairment	0
Capitalized contract cost, amortization	10,200,000	15,400,000	12,000,000.0
Capitalized contract cost, impairment	0
Current contract assets	76,292,000	59,143,000	30,277,000
Deferred revenue	238,634,000	276,737,000	324,729,000
Customer One
Disaggregation Of Revenue [Line Items]
Total revenues	55,400,000	72,000,000.0	76,900,000
Customer Two
Disaggregation Of Revenue [Line Items]
Total revenues	48,900,000	41,600,000
United States
Disaggregation Of Revenue [Line Items]
Total revenues	100,564,000	135,033,000	129,338,000
Germany
Disaggregation Of Revenue [Line Items]
Total revenues	74,550,000	114,936,000	100,674,000
Japan
Disaggregation Of Revenue [Line Items]
Total revenues	$ 74,480,000	$ 62,840,000	$ 50,936,000
Revenues | Customer Concentration Risk
Disaggregation Of Revenue [Line Items]
Number of customers accounted for revenues | Customer	2	2	1
Revenues | Customer Concentration Risk | Customer One
Disaggregation Of Revenue [Line Items]
Percentage of revenue	16.90%	18.60%	23.20%
Revenues | Customer Concentration Risk | Customer Two
Disaggregation Of Revenue [Line Items]
Percentage of revenue	14.90%	10.80%
Minimum
Disaggregation Of Revenue [Line Items]
Connected services contract term	1 year
Contract acquisition cost, deferred and amortized over benefit period	1 year
Contract term	1 year
Minimum | Revenues | United States | Geographic Concentration Risk
Disaggregation Of Revenue [Line Items]
Percentage of revenue	10.00%	10.00%	10.00%
Minimum | Revenues | Germany | Geographic Concentration Risk
Disaggregation Of Revenue [Line Items]
Percentage of revenue	10.00%	10.00%	10.00%
Minimum | Revenues | Japan | Geographic Concentration Risk
Disaggregation Of Revenue [Line Items]
Percentage of revenue	10.00%	10.00%	10.00%
Maximum
Disaggregation Of Revenue [Line Items]
Connected services contract term	5 years
Contract acquisition costs, expected benefit period	1 year
Contract acquisition cost, deferred and amortized over benefit period	8 years
Contract term	8 years