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Convertible Senior Notes - Interest Costs Recognized on 2026 Notes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Debt Instrument [Line Items]
Total interest expense recognized	$ 1,319	$ 0	$ 1,319	$ 0
Convertible Debt | 2026 Notes
Debt Instrument [Line Items]
Contractual interest expense	172	0	172	0
Amortization of debt discount and issuance costs	1,147	0	1,147	0
Total interest expense recognized	$ 1,319	$ 0	$ 1,319	$ 0

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