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Financing receivable, net - Allowance for credit loss - Rollforward (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Allowance for credit losses for financing receivables:        
Balances at beginning of the period $ 77 $ 0 $ 0 $ 0
Charge-offs 0 0 0 0
Provision charged to Consolidated Statements of Operations (7) 0 (12) 0
Balances at end of the period 70 0 70 0
Low Risk Rating        
Allowance for credit losses for financing receivables:        
Balances at beginning of the period 16 0 0 0
Charge-offs 0 0 0 0
Provision charged to Consolidated Statements of Operations 0 0 (11) 0
Balances at end of the period 16 0 16 0
Moderate Risk Rating        
Allowance for credit losses for financing receivables:        
Balances at beginning of the period 61 0 0 0
Charge-offs 0 0 0 0
Provision charged to Consolidated Statements of Operations (7) 0 (1) 0
Balances at end of the period $ 54 0 54 0
Adoption of Accounting Standards Update 2016-13        
Allowance for credit losses for financing receivables:        
Balances at beginning of the period     82  
Balances at end of the period   0   0
Adoption of Accounting Standards Update 2016-13 | Low Risk Rating        
Allowance for credit losses for financing receivables:        
Balances at beginning of the period     27  
Balances at end of the period   0   0
Adoption of Accounting Standards Update 2016-13 | Moderate Risk Rating        
Allowance for credit losses for financing receivables:        
Balances at beginning of the period     $ 55  
Balances at end of the period   $ 0   $ 0