Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Schedule of disaggregation of revenue (Details)

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Summary of Significant Accounting Policies - Schedule of disaggregation of revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Disaggregation Of Revenue [Line Items]        
Total operating revenues $ 18,113 $ 21,294 $ 32,098 $ 31,882
Revenue recognized at a point-in-time        
Disaggregation Of Revenue [Line Items]        
Total operating revenues 16,974 20,575 29,959 30,654
Revenue recognized over time        
Disaggregation Of Revenue [Line Items]        
Total operating revenues $ 1,139 $ 719 $ 2,139 $ 1,228