CONVERTIBLE SENIOR NOTES- Narrative (Details)		3 Months Ended
	Feb. 05, 2021 USD ($) tradingDay shares $ / shares	Dec. 31, 2023 USD ($) shares	Sep. 30, 2023 USD ($)	Jan. 13, 2023	Feb. 28, 2021 USD ($)	Feb. 02, 2021 $ / shares
Debt Instrument [Line Items]
Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]		Convertible senior notes
2026 Notes | Convertible Debt
Debt Instrument [Line Items]
Debt issued		$ 155,300,000			$ 155,300,000
Debt interest rate (as a percent)	0.75%	75.00%
Debt conversion ratio (per $1,000 principal amount)	0.0479731000
Debt conversion price (in dollars per share) | $ / shares	$ 20.85
Conversion price premium percentage						37.50%
Proceeds from debt offerings, net of discounts, commissions and expenses	$ 149,700,000
Debt issuance costs	$ 5,500,000
Remaining unamortized debt discount		$ 17,764,000	$ 19,734,000
2026 Notes | Convertible Debt | Common Stock
Debt Instrument [Line Items]
Share price (in dollars per share) | $ / shares						$ 15.16
2026 Notes | Convertible Debt | During any calendar quarter commencing after the calendar quarter ending on June 30, 2021
Debt Instrument [Line Items]
Debt conversion price percentage	130.00%
Trading days in period (in days) | tradingDay	20
Consecutive trading days in period (in days) | tradingDay	30
2026 Notes | Convertible Debt | Measurement period
Debt Instrument [Line Items]
Debt conversion price percentage	98.00%
Consecutive trading days in period (in days) | tradingDay	5
2026 Notes | Convertible Debt | Embedded Derivative Financial Instruments
Debt Instrument [Line Items]
Payment costs related to hedge transactions	$ 9,300,000
Embedded derivative, fair value of embedded derivative liability	33,200,000
Value of remaining embedded derivative allocated to host contract	$ 116,500,000
Derivative interest rate		6.71%
Remaining unamortized debt discount		$ 17,800,000
Remaining debt discount amortization period (in years)		2 years 1 month 6 days
2026 Notes | Convertible Debt | Interest Rate Period One
Debt Instrument [Line Items]
Additional interest percentage				0.25%
Interest rate threshold period				90 days
2026 Notes | Convertible Debt | Interest Rate Period Two
Debt Instrument [Line Items]
Additional interest percentage				0.50%
Interest rate threshold period				180 days
Additional Notes | Convertible Debt
Debt Instrument [Line Items]
Option period to purchase additional notes (in days)	13 days
Additional aggregate principal amount purchased	$ 20,250,000
Notes Hedge | Convertible Debt
Debt Instrument [Line Items]
Debt conversion price (in dollars per share) | $ / shares	$ 20.85
Conversion price premium percentage						75.00%
Number of shares that can initially be converted into common stock (in shares) | shares	7,400,000
Strike price of warrants (in dollar per share) | $ / shares	$ 26.53
Senior notes hedge balance	$ 33,200,000
Shares purchased under the notes hedge (in shares) | shares		0
Increase in additional paid-in-capital for sale or warrants	$ 23,900,000
Warrants exercised (in shares) | shares		0
Warrants outstanding (in shares) | shares		0
Notes Hedge | Convertible Debt | Observation period
Debt Instrument [Line Items]
Consecutive trading days in period (in days) | tradingDay	80
Incremental dilution of earnings per share of warrants (in shares) | shares		0