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CONVERTIBLE SENIOR NOTES - Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Nov. 07, 2024 USD ($) $ / shares shares | Jun. 30, 2023 USD ($) $ / shares | Feb. 16, 2021 USD ($) $ / shares | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | $ 0 | $ 0 | $ 0 | $ 2,033 |
2028 Convertible Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issuance costs |  | $ 1,500 |  |  |  |  |  |
Aggregate outstanding balance |  |  |  | 457,870 |  | 457,870 |  | $ 457,626
Principal amount |  |  |  | 459,000 |  | 459,000 |  | 459,000
2028 Convertible Senior Notes | Convertible Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, stated interest rate |  |  | 1.50% |  |  |  |  |
Principal amount of notes |  | 441,000 | $ 900,000 |  |  |  |  |
Debt instrument, convertible, conversion ratio |  |  | 0.0229885 |  |  |  |  |
Conversion price per share (in dollars per share) | $ / shares |  |  | $ 43.50 |  |  |  |  |
Debt redemption, percentage of conversion price |  |  | 150.00% |  |  |  |  |
Debt redemption, trading days |  |  | 20 days |  |  |  |  |
Debt redemption, consecutive trading days |  |  | 30 days |  |  |  |  |
Redemption price, percentage |  |  | 100.00% |  |  |  |  |
Debt instrument, debt default, calendar days |  |  | 360 days |  |  |  |  |
Debt instrument, interest in the event of default |  |  | 0.25% |  |  |  |  |
Additional interest in the event of default |  |  | 0.50% |  |  |  |  |
Debt issuance costs |  |  | $ 4,500 |  |  |  |  |
Debt instrument, effective interest rate |  |  | 1.60% |  |  |  |  |
Aggregate outstanding balance |  | 459,000 |  |  |  |  |  |
Fair value of convertible debt |  |  |  | 399,100 |  | 399,100 |  |
Principal amount |  | 459,000 |  |  |  |  |  |
2028 Convertible Senior Notes | Convertible Debt | Subsequent Event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount | $ 459,000 |  |  |  |  |  |  |
Beneficial conversion feature | $ 50,000 |  |  |  |  |  |  |
2028 Convertible Senior Notes | Convertible Debt | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, debt default, calendar days |  |  | 181 days |  |  |  |  |
2028 Convertible Senior Notes | Convertible Debt | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, debt default, calendar days |  |  | 360 days |  |  |  |  |
2028 Convertible Senior Notes | Debt Conversion Terms One | Convertible Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, debt default, calendar days |  |  | 180 days |  |  |  |  |
2028 Convertible Senior Notes | Debt Conversion Terms Two | Convertible Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, debt default, calendar days |  |  | 361 days |  |  |  |  |
2030 Convertible Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issuance costs |  | $ 7,300 |  |  |  |  |  |
Aggregate outstanding balance |  |  |  | 435,274 |  | 435,274 |  | 434,617
Principal amount |  |  |  | 441,000 |  | 441,000 |  | 441,000
2030 Convertible Senior Notes | Convertible Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, stated interest rate |  | 1.375% |  |  |  |  |  |
Principal amount of notes |  | $ 441,000 |  |  |  |  |  |
Debt instrument, convertible, conversion ratio |  | 0.0465116 |  |  |  |  |  |
Conversion price per share (in dollars per share) | $ / shares |  | $ 21.50 |  |  |  |  |  |
Debt redemption, percentage of conversion price |  | 150.00% |  |  |  |  |  |
Debt redemption, trading days |  | 20 days |  |  |  |  |  |
Debt redemption, consecutive trading days |  | 30 days |  |  |  |  |  |
Redemption price, percentage |  | 100.00% |  |  |  |  |  |
Debt instrument, debt default, calendar days |  | 360 days |  |  |  |  |  |
Debt instrument, interest in the event of default |  | 0.25% |  |  |  |  |  |
Additional interest in the event of default |  | 0.50% |  |  |  |  |  |
Debt instrument, effective interest rate |  | 1.60% |  |  |  |  |  |
Fair value of convertible debt |  |  |  | $ 347,100 |  | $ 347,100 |  |
2030 Convertible Senior Notes | Convertible Debt | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, debt default, calendar days |  | 181 days |  |  |  |  |  |
2030 Convertible Senior Notes | Convertible Debt | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, debt default, calendar days |  | 360 days |  |  |  |  |  |
2030 Convertible Senior Notes | Debt Conversion Terms One | Convertible Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, debt default, calendar days |  | 180 days |  |  |  |  |  |
2030 Convertible Senior Notes | Debt Conversion Terms Two | Convertible Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, debt default, calendar days |  | 361 days |  |  |  |  |  |
Exchange Transaction |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  | $ 2,000
Exchange Transaction | Convertible Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount of notes |  | $ 441,000 |  |  |  |  |  |
Paid accrued but unpaid interest |  | $ 2,500 |  |  |  |  |  |
2029 Convertible Senior Notes | Convertible Debt | Subsequent Event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, stated interest rate | 1.50% |  |  |  |  |  |  |
Principal amount of notes | $ 200,000 |  |  |  |  |  |  |
Debt instrument, convertible, conversion ratio | 0.2045157 |  |  |  |  |  |  |
Conversion price per share (in dollars per share) | $ / shares | $ 4.89 |  |  |  |  |  |  |
Redemption price, percentage | 100.00% |  |  |  |  |  |  |
Debt instrument, debt default, calendar days | 360 days |  |  |  |  |  |  |
Debt conversion, shares issued (in shares) | shares | 20,451,570 |  |  |  |  |  |  |
2029 Convertible Senior Notes | Debt Conversion Terms One | Convertible Debt | Subsequent Event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, debt default, calendar days | 180 days |  |  |  |  |  |  |
Debt instrument, interest in the event of default | 0.25% |  |  |  |  |  |  |
2029 Convertible Senior Notes | Debt Conversion Terms Two | Convertible Debt | Subsequent Event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, debt default, calendar days | 361 days |  |  |  |  |  |  |
Additional interest in the event of default | 0.50% |  |  |  |  |  |  |
2029 Convertible Senior Notes | Debt Conversion Terms Two | Convertible Debt | Minimum | Subsequent Event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, debt default, calendar days | 181 days |  |  |  |  |  |  |
2029 Convertible Senior Notes | Debt Conversion Terms Two | Convertible Debt | Maximum | Subsequent Event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, debt default, calendar days | 360 days |  |  |  |  |  |  |

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