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Convertible Senior Notes - Additional Information (Detail) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 14, 2023 USD ($) | Sep. 30, 2025 USD ($) Days $ / shares | Sep. 30, 2025 USD ($) $ / shares | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Notes, carrying value |  | $ 537,927,000 | $ 537,927,000 | $ 525,567,000 |
Modified 2019 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amortization of debt issuance costs | $ 7,800,000 |  |  |  |
1.00% Convertible Senior Notes due 2028 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate principal amount |  | $ 600,000,000 | $ 600,000,000 | 600,000,000 |
Notes, interest rate |  | 1.00% | 1.00% |  |
Debt istrument cancelled | 309,900,000 |  |  |  |
Unamortized debt issuance costs |  | $ 5,478,000 | $ 5,478,000 | 6,721,000 |
Aggregate debt discount |  | $ 56,595,000 | $ 56,595,000 | 67,712,000 |
Notes conversion ratio per $1,000 principal amount |  |  | 4,924.7000 |  |
Debt instrument, terms of conversion |  |  | The initial conversion rate for the 2023 Notes is 4.9247 shares of the Company’s common stock per $1,000 principal amount of 2023 Notes, which is equivalent to an initial conversion price of $203.06 per share and represents a 30% premium over the last reported sale price of $156.20 per share on December 6, 2023, the date on which the 2023 Notes were priced. |  |
Notes initial conversion price | $ / shares |  | $ 203.06 | $ 203.06 |  |
Effective interest rate on the Notes |  | 4.39% | 4.39% |  |
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 |  | $ 537,927,000 | $ 537,927,000 | 525,567,000 |
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% |  |  |
1.00% Convertible Senior Notes due 2028 | Common Stock |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate principal amount |  | $ 1,000 | 1,000 |  |
1.00% Convertible Senior Notes due 2028 | Exchange And Subscription Agreements |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate principal amount | 600,000,000 |  |  |  |
1.00% Convertible Senior Notes due 2028 | Subscription Transactions |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate principal amount | 290,100,000 |  |  |  |
Proceeds from issuance of 2023 convertible senior notes | 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] |  |  |  |  |
Aggregate principal amount |  | 54,800,000 | 54,800,000 | 65,500,000 |
Unamortized debt issuance costs |  |  |  |  | $ 7,700,000
Aggregate debt discount |  | 56,600,000 | 56,600,000 | 67,700,000 |
Payment of debt issuance costs | 6,200,000 |  |  |  |
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 |  |  | $ 1,800,000 | $ 2,200,000 |
1.00% Convertible Senior Notes due 2028 | 2023 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes redemption price |  |  | 100.00% |  |
Notes, carrying value |  | $ 537,900,000 | $ 537,900,000 |  |

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