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Debt - Schedule of Interest Expense (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Debt Instrument [Line Items]        
(Gain) loss on extinguishment of debt $ 3,500 $ 0 $ 3,545 $ 0
Senior Notes | 2029 Convertible Notes        
Debt Instrument [Line Items]        
Contractual interest expense   8,625 6,900 0
Amortization of deferred financing costs   972 742 0
Total interest expense   9,597 7,642 0
Senior Notes | 2025 Convertible Notes        
Debt Instrument [Line Items]        
Contractual interest expense   2,455 2,779 4,097
Amortization of deferred financing costs   509 559 797
(Gain) loss on extinguishment of debt   0 (5,389) 0
Total interest expense   2,964 (2,051) 4,894
Senior Notes | 2024 Convertible Notes        
Debt Instrument [Line Items]        
Contractual interest expense   742 1,609 4,133
Amortization of deferred financing costs   124 260 635
(Gain) loss on extinguishment of debt   0 8,935 0
Total interest expense   $ 866 $ 10,804 $ 4,768