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Convertible Senior Notes - Carrying Value of 2026 Notes (Details) - Convertible Debt - 2026 Notes - USD ($)
Mar. 31, 2023
Sep. 30, 2022
Feb. 05, 2021
Debt Instrument [Line Items]      
Debt interest rate (as a percent) 75.00%   0.75%
Debt issued $ 155,300,000   $ 155,300,000
Principal amount 155,250,000 $ 155,250,000  
Less: unamortized discount and issuance costs, net of amortization (23,580,000) (27,280,000)  
Carrying amount $ 131,670,000 $ 127,970,000