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Convertible Senior Notes - Additional Information (Detail) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 14, 2023 USD ($) | Jul. 19, 2019 USD ($) | Sep. 30, 2024 USD ($) Days $ / shares | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 06, 2023 $ / shares | Jul. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Amortization of debt issuance costs |  |  | $ 429,000 | $ 459,000 | $ 1,432,000 | $ 1,373,000 |  |  |
Proceeds from issuance of common stock, net of issuance costs |  |  |  |  |  | $ (13,000) |  |  |
1.00% Convertible Senior Notes due 2028 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Notes issued | $ 290,100,000 |  |  |  |  |  |  |  |
Notes, interest rate |  |  | 1.00% |  | 1.00% |  |  |  |
Notes for cash | 290,100,000 |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  | $ 7,132,000 |  | $ 7,132,000 |  | $ 8,400,000 |  |
Aggregate debt discount |  |  | $ 71,261,000 |  | $ 71,261,000 |  | 81,457,000 |  |
Notes conversion ratio per $1,000 principal amount |  |  |  |  | 4,924.7000 |  |  |  |
Notes initial conversion price | $ / shares |  |  | $ 203.06 |  | $ 203.06 |  |  |  |
Premium over sale price |  |  |  |  | 30.00% |  |  |  |
Closing price of common stock | $ / shares |  |  |  |  |  |  |  | $ 156.2 |
Interest repayment terms |  |  |  |  | Interest is payable semi-annually in arrears on each of June 15 and December 15, which commenced on June 15, 2024 |  |  |  |
Notes, due date |  |  |  |  | Dec. 15, 2028 |  |  |  |
Notes, carrying value |  |  | $ 521,600,000 |  | $ 521,600,000 |  | 510,100,000 |  |
Fair value of the note |  |  | 553,300,000 |  | 553,300,000 |  | 596,000,000 |  |
1.00% Convertible Senior Notes due 2028 | Common Stock |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Notes issued |  |  | 1,000 |  | 1,000 |  |  |  |
1.00% Convertible Senior Notes due 2028 | Exchange And Subscription Agreements |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Notes issued | 600,000,000 |  |  |  |  |  |  |  |
1.00% Convertible Senior Notes due 2028 | Subscription Transactions |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Notes issued | 290,100,000 |  |  |  |  |  |  |  |
Proceeds from issuance of convertible senior notes, net of costs | 276,100,000 |  |  |  |  |  |  |  |
Notes for cash | 290,100,000 |  |  |  |  |  |  |  |
Payment of debt issuance costs | 13,900,000 |  |  |  |  |  |  |  |
Proceeds from issuance of common stock, net of issuance costs | 14,400,000 |  |  |  |  |  |  |  |
1.00% Convertible Senior Notes due 2028 | Exchanged 2019 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt | 29,600,000 |  |  |  |  |  | 12,700,000 |  |
Debt instrument exchanged amount | 217,700,000 |  |  |  |  |  |  |  |
Modification of debt | 188,100,000 |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  |  |  |  |  | 100,000 |  |
1.00% Convertible Senior Notes due 2028 | Modified 2019 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Notes issued |  |  | 68,900,000 |  | 68,900,000 |  | 78,700,000 |  |
Unamortized debt issuance costs |  |  |  |  |  |  | 7,700,000 |  |
Aggregate debt discount |  |  | 71,300,000 |  | 71,300,000 |  | 81,500,000 |  |
Payment of debt issuance costs | 6,200,000 |  |  |  |  |  |  |  |
Amortization of debt issuance costs | 7,700,000 |  |  |  |  |  |  |  |
1.00% Convertible Senior Notes due 2028 | Modified 2019 Notes | Additional Paid-In Capital |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Conversion of Convertible Securities Stock Issued | value | $ 2,800,000 |  |  |  |  |  |  |  |
1.00% Convertible Senior Notes due 2028 | Modified 2019 Notes | Fair Value Of Embedded Conversion Option |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Conversion of Convertible Securities Stock Issued | value |  |  |  |  | $ 2,400,000 |  | 2,800,000 |  |
1.00% Convertible Senior Notes due 2028 | 2023 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Notes redemption price |  |  |  |  | 100.00% |  |  |  |
Notes, carrying value |  |  | 521,600,000 |  | $ 521,600,000 |  | 510,100,000 |  |
0.375% Convertible Senior Notes due 2024 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Notes issued |  | $ 287,500,000 | 69,500,000 |  | 69,500,000 |  | 69,700,000 |  | $ 287,500,000
Debt conversion original debt amount |  |  |  |  | 200,000 |  |  |  |
Proceeds from issuance of convertible senior notes, net of costs |  | 278,500,000 |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  | $ 0 |  | $ 0 |  | 248,000 |  |
Notes, carrying value |  |  |  |  |  |  | 69,500,000 |  |
Fair value of the note |  |  |  |  |  |  | 109,800,000 |  |
Additional Notes issued |  | $ 37,500,000 |  |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Trading Days | Days |  |  | 20 |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Consecutive Trading Days | Days |  |  | 30 |  |  |  |  |  |
Notes threshold percentage of stock price trigger |  |  | 130.00% |  |  |  |  |  |
Debt conversion, stock issued as premium | shares |  |  |  |  | 100,942 |  |  |  |
Debt conversion, cash paid for principal amount and interest |  |  |  |  | $ 69,600,000 |  |  |  |
0.375% Convertible Senior Notes due 2024 | Exchange Transaction |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Notes issued |  |  |  |  |  |  | $ 69,700,000 |  |

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