v3.25.2
Revenue Recognition - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2025
Jun. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
Disaggregation Of Revenue [Line Items]              
Total revenues $ 62,236,000 $ 70,539,000   $ 191,142,000 $ 276,699,000    
Deferred revenue     $ 67,800,000        
Contract acquisition costs 5,700,000     5,700,000   $ 7,100,000  
Contract acquisition cost, amortization 600,000 1,000,000.0   1,800,000 2,700,000    
Contract acquisition cost, impairment       0      
Capitalized contract cost, amortization 1,500,000 1,300,000   5,000,000.0 7,100,000    
Capitalized contract cost, impairment       0      
Accounts receivable, net 62,220,000     62,220,000   62,755,000 $ 61,300,000
Contract assets 16,289,000     16,289,000   22,219,000 56,700,000
Deferred revenue 185,991,000     185,991,000   $ 167,176,000 $ 222,600,000
Customer One              
Disaggregation Of Revenue [Line Items]              
Total revenues 9,400,000 $ 20,600,000   23,900,000 $ 81,500,000    
Customer Two              
Disaggregation Of Revenue [Line Items]              
Total revenues 7,100,000            
Customer Three              
Disaggregation Of Revenue [Line Items]              
Total revenues 6,900,000            
Korea              
Disaggregation Of Revenue [Line Items]              
Total revenues 8,000,000.0     26,200,000      
China              
Disaggregation Of Revenue [Line Items]              
Total revenues $ 7,300,000     $ 17,600,000      
Revenues | Customer Concentration Risk | Customer One              
Disaggregation Of Revenue [Line Items]              
Percentage of revenue 15.10% 29.20%   12.50% 29.50%    
Revenues | Customer Concentration Risk | Customer Two              
Disaggregation Of Revenue [Line Items]              
Percentage of revenue 11.40%            
Revenues | Customer Concentration Risk | Customer Three              
Disaggregation Of Revenue [Line Items]              
Percentage of revenue 11.10%            
Revenues | China | Geographic Concentration Risk              
Disaggregation Of Revenue [Line Items]              
Percentage of revenue 10.00%            
Minimum | Revenues | Korea | Geographic Concentration Risk              
Disaggregation Of Revenue [Line Items]              
Percentage of revenue 10.00%     10.00%