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Segment Information - Major customers (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
customer
Dec. 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2024
USD ($)
customer
Mar. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Segment Reporting Information [Line Items]            
Customer Revenues $ 13,706   $ 13,269 $ 29,081 $ 31,613  
Finance receivables 7,625     7,625   $ 7,171
Customer A | Sales Revenue, Net | Customer Concentration Risk            
Segment Reporting Information [Line Items]            
Customer Revenues $ 2,100     $ 2,100    
Concentration risk percentage 15.00%     7.00%    
Customer A | Accounts Receivable | Customer Concentration Risk            
Segment Reporting Information [Line Items]            
Accounts receivable, gross $ 2,400     $ 2,400    
Concentration risk percentage       19.00%    
Customer B | Sales Revenue, Net | Customer Concentration Risk            
Segment Reporting Information [Line Items]            
Customer Revenues $ 100   $ 1,300 $ 600 $ 1,800  
Concentration risk percentage 1.00%   10.00% 2.00% 6.00%  
Customer One | Accounts Receivable | Customer Concentration Risk            
Segment Reporting Information [Line Items]            
Accounts receivable, gross $ 6,400     $ 6,400    
Concentration risk percentage       50.00%    
Number of customers accounted | customer 1     1    
Customer One | Financing receivables | Customer Concentration Risk            
Segment Reporting Information [Line Items]            
Finance receivables $ 2,200     $ 2,200   $ 2,500
Concentration risk percentage 22.00%         22.00%
Customer not listed in table | Financing receivables | Customer Concentration Risk            
Segment Reporting Information [Line Items]            
Finance receivables $ 5,700     $ 5,700   $ 7,400
Concentration risk percentage       58.00%   65.00%
Customer not listed | Financing receivables | Customer Concentration Risk            
Segment Reporting Information [Line Items]            
Finance receivables   $ 1,300       $ 1,500
Concentration risk percentage   13.00%       13.00%