Long-Term Debt - Schedule of Interest Expense Related to Notes (Details) - 3.00% Convertible Senior Notes Due 2025 - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Debt Instrument [Line Items]
Contractual interest expense	$ 1,294	$ 1,294	$ 2,616	$ 2,616
Amortization of debt discount		919		1,843
Amortization of issuance costs	276	231	556	463
Total interest expense related to the Notes	$ 1,570	$ 2,444	$ 3,172	$ 4,922