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Revenue Recognition - Additional Information (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
Customer
Dec. 31, 2022
Mar. 31, 2022
USD ($)
Customer
Mar. 31, 2023
USD ($)
Customer
Mar. 31, 2022
USD ($)
Customer
Sep. 30, 2022
USD ($)
Disaggregation Of Revenue [Line Items]            
Revenues $ 68,393,000   $ 86,280,000 $ 152,051,000 $ 180,706,000  
Minimum purchase commitment deals of revenue     19,900,000   40,100,000  
Distribution period       5 years    
Contract acquisition costs 8,400,000         $ 8,300,000
Contract acquisition cost, amortization 800,000   500,000 $ 1,600,000 1,100,000  
Contract acquisition cost, impairment       0    
Capitalized contract cost, amortization 2,500,000   2,700,000 5,200,000 5,500,000  
Capitalized contract cost, impairment       0    
Customer One            
Disaggregation Of Revenue [Line Items]            
Revenues 10,800,000   21,900,000 22,400,000 46,200,000  
Customer Two            
Disaggregation Of Revenue [Line Items]            
Revenues 7,200,000   10,200,000 20,800,000 28,100,000  
United States            
Disaggregation Of Revenue [Line Items]            
Revenues 21,742,000   21,955,000 43,098,000 57,084,000  
Germany            
Disaggregation Of Revenue [Line Items]            
Revenues 24,627,000   23,131,000 42,791,000 42,640,000  
Japan            
Disaggregation Of Revenue [Line Items]            
Revenues 5,738,000   $ 25,413,000 31,579,000 $ 51,489,000  
China            
Disaggregation Of Revenue [Line Items]            
Revenues $ 7,000,000.0     $ 16,700,000    
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 15.80%   25.40% 14.70% 25.50%  
Revenues | Customer Concentration Risk | Customer Two            
Disaggregation Of Revenue [Line Items]            
Percentage of revenue 10.50%   11.80% 13.70% 15.60%  
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 | China | Geographic Concentration Risk            
Disaggregation Of Revenue [Line Items]            
Percentage of revenue   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