Revenue Recognition - Additional Information (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2022 USD ($) Customer	Mar. 31, 2021 USD ($) Customer	Mar. 31, 2022 USD ($) Customer	Mar. 31, 2021 USD ($) Customer	Sep. 30, 2021 USD ($)
Disaggregation Of Revenue [Line Items]
Revenues	$ 86,280,000	$ 98,662,000	$ 180,706,000	$ 192,305,000
Minimum commitment deals of revenue	19,900,000		$ 40,100,000
Distribution period			5 years
Contract acquisition costs			$ 7,600,000		$ 6,900,000
Contract acquisition cost, amortization	400,000	500,000	1,100,000	800,000
Contract acquisition cost, impairment			0
Capitalized contract cost, amortization	2,700,000	3,100,000	5,500,000	7,400,000
Capitalized contract cost, impairment			0
Customer One
Disaggregation Of Revenue [Line Items]
Revenues	21,900,000	17,400,000	46,200,000	35,200,000
Customer Two
Disaggregation Of Revenue [Line Items]
Revenues	10,200,000	17,300,000	28,100,000	24,800,000
United States
Disaggregation Of Revenue [Line Items]
Revenues	21,955,000	36,781,000	57,084,000	68,875,000
Germany
Disaggregation Of Revenue [Line Items]
Revenues	23,131,000	24,667,000	42,640,000	56,711,000
Japan
Disaggregation Of Revenue [Line Items]
Revenues	$ 25,413,000	$ 13,779,000	$ 51,489,000	$ 26,452,000
Revenues | Customer Concentration Risk
Disaggregation Of Revenue [Line Items]
Number of customers accounted for revenues | Customer	2	2	2	2
Revenues | Customer Concentration Risk | Customer One
Disaggregation Of Revenue [Line Items]
Percentage of revenue	25.40%	17.70%	25.50%	18.30%
Revenues | Customer Concentration Risk | Customer Two
Disaggregation Of Revenue [Line Items]
Percentage of revenue	11.80%	17.50%	15.60%	12.90%
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		1 year
Minimum | Revenues | United States | Geographic Concentration Risk
Disaggregation Of Revenue [Line Items]
Percentage of revenue	10.00%	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%	10.00%
Minimum | Revenues | Japan | Geographic Concentration Risk
Disaggregation Of Revenue [Line Items]
Percentage of revenue	10.00%	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		8 years