Convertible Senior Notes - Narrative (Details)		1 Months Ended			2 Months Ended	3 Months Ended	6 Months Ended	9 Months Ended		12 Months Ended
	Nov. 01, 2022 d	Aug. 31, 2022 USD ($)	Jan. 31, 2021 USD ($)	May 31, 2018 USD ($) d $ / shares shares	Sep. 30, 2022 USD ($) option	Sep. 30, 2022 USD ($) option	Jun. 30, 2022 USD ($)	Sep. 30, 2022 USD ($) option	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) option shares
Debt Instrument [Line Items]
Gain on extinguishment of debt								$ 4,192,000	$ (7,303,000)
Adjustments to additional paid-in-capital from warrants								$ 200,000		$ 500,000
Payments to unwind warrants										18,400,000
Proceeds from unwinding convertible bond hedges					$ 200,000					$ 18,900,000
Number of options under convertible bond hedges | option					370,219	370,219		370,219		598,021
Convertible Notes | 2023 Convertible Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percent)				0.75%
Aggregate principal amount outstanding				$ 750,000,000	$ 76,854,000	$ 76,854,000		$ 76,854,000		$ 343,301,000
Proceeds from debt, net of issuance costs				$ 733,100,000
Initial conversion rate (shares per $1,000)				0.0040244
Initial conversion price (in USD per share) | $ / shares				$ 248.48
Debt issuance costs					$ 16,900,000	$ 16,900,000		$ 16,900,000
Term of debt instrument								5 years
Effective interest rate (as a percent)					0.50%	0.50%		0.50%
Total interest expense						$ 300,000		$ 1,500,000
Contractual interest expense						200,000		900,000
Amortized issuance costs						100,000		600,000
Repurchased amount of debt instrument			$ 20,300,000					266,400,000		152,000,000
Repayments of notes			19,100,000					261,400,000		156,000,000
Accrued interest portion of repurchased amount of debt instrument			$ 100,000				$ 400,000	500,000		300,000
Outstanding principal amount of debt										$ 343,300,000
Gain on extinguishment of debt								4,200,000
Decrease in debt discount								$ 1,300,000
Warrants issued in public offering (in shares) | shares				3,018,327						2,559,254
Payments for convertible bond hedges				$ 140,300,000
Warrant exercise price (in USD per share) | $ / shares				$ 315.38
Adjustments to additional paid-in-capital from warrants				$ 90,000,000
Accrued interest										$ 300,000
Convertible Notes | 2023 Convertible Senior Notes | Notes repurchased during current period
Debt Instrument [Line Items]
Repurchased amount of debt instrument						38,600,000
Repayments of notes						37,700,000
Accrued interest portion of repurchased amount of debt instrument						100,000
Gain on extinguishment of debt						900,000
Decrease in debt discount						$ 100,000
Convertible Notes | 2023 Convertible Senior Notes | Notes repurchased in August 2022
Debt Instrument [Line Items]
Repurchased amount of debt instrument		$ 227,800,000
Repayments of notes		$ 223,700,000
Convertible Notes | 2023 Convertible Senior Notes | Subsequent Event
Debt Instrument [Line Items]
Consecutive trading days | d	10
Convertible Notes | 2023 Convertible Senior Notes | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Threshold trading days | d				20
Consecutive trading days | d				30
Stock price trigger to classify convertible debt as current (as a percent)				130.00%
Convertible Notes | 2023 Convertible Senior Notes | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Threshold trading days | d				5
Consecutive trading days | d				10
Maximum threshold of debt trading price trigger (as a percent)				98.00%
Convertible Notes | 2023 Convertible Senior Notes | Maximum
Debt Instrument [Line Items]
Initial conversion rate (shares per $1,000)				0.0052317
Initial conversion price (in USD per share) | $ / shares				$ 191.14