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Long-term Debt - Additional Information (Detail) |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
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May 13, 2024 USD ($) | Feb. 27, 2024 USD ($) | May 12, 2020 USD ($) | Sep. 16, 2019 USD ($) | Jul. 31, 2022 USD ($) shares | Jul. 31, 2021 USD ($) shares | Jan. 31, 2021 USD ($) shares | Sep. 30, 2024 USD ($) $ / shares | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) Days $ / shares | Sep. 30, 2023 USD ($) | Mar. 08, 2024 $ / shares | Dec. 31, 2023 USD ($) | Nov. 09, 2019 CounterParty $ / shares
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion ratio |  |  |  |  |  |  |  |  |  | 25,340.5000 |  |  |  |
Proceeds from credit facility |  |  |  |  |  |  |  |  |  | $ 365,454,000 |  |  |  |
SFJ Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for buyout of development liability elimination | $ 366,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for buyout of development liability which is due in 2025 | $ 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Notes Due 2026 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, stated percentage |  |  |  | 3.50% |  |  |  |  |  |  |  |  |  |
Debt instrument, due and payment description |  |  |  |  |  |  |  |  |  | The Convertible Notes are senior unsecured obligations of the Company and bear interest at a rate of 3.5% per year payable semiannually in arrears on March 15 and September 15 of each year, beginning on March 15, 2020. |  |  |  |
Debt instrument, frequency of periodic payment |  |  |  |  |  |  |  |  |  | semiannually |  |  |  |
Credit facility maturity date |  |  |  | Sep. 15, 2026 |  |  |  |  |  |  |  |  |  |
Threshold trading days | Days |  |  |  |  |  |  |  |  |  | 20 |  |  |  |
Threshold consecutive trading days | Days |  |  |  |  |  |  |  |  |  | 30 |  |  |  |
Threshold percentage of stock price trigger |  |  |  |  |  |  |  |  |  | 130.00% |  |  |  |
Redemption period, start date |  |  |  |  |  |  |  |  |  | Sep. 20, 2023 |  |  |  |
Redemption price, percentage |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |
Debt interest expense |  |  |  |  |  |  |  | $ 900,000 | $ 897,000 | $ 2,695,000 | $ 2,687,000 |  |  |
Long-term debt outstanding amount |  |  |  |  |  |  |  | $ 93,263,000 |  | $ 93,263,000 |  |  | $ 93,033,000 |
Convertible Senior Notes Due 2026 [Member] | Prior to March 15, 2026 Convertible [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold trading days | Days |  |  |  |  |  |  |  |  |  | 20 |  |  |  |
Threshold consecutive trading days | Days |  |  |  |  |  |  |  |  |  | 30 |  |  |  |
Threshold percentage of stock price trigger |  |  |  |  |  |  |  |  |  | 130.00% |  |  |  |
Trading price per principal amount |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |
Convertible Senior Notes Due 2026 [Member] | Prior to March 15, 2026 Convertible [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger |  |  |  |  |  |  |  |  |  | 98.00% |  |  |  |
Convertible Senior Notes Due 2026 [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Terms of conversion |  |  |  |  |  |  |  |  |  | The Convertible Notes are convertible into shares of the Company’s common stock at an initial conversion rate of 25.3405 shares per $1,000 principal amount of Convertible Notes (equivalent to an initial conversion price of approximately $39.4625 per share of common stock). The conversion rate is subject to customary anti-dilution adjustments. In addition, following certain events that occur prior to the maturity date or if the Company delivers a notice of redemption, the Company will increase the conversion rate for a holder who elects to convert its Convertible Notes in connection with such corporate event or a notice of redemption, as the case may be, in certain circumstances as provided in the Indenture. |  |  |  |
Conversion price | $ / shares |  |  |  |  |  |  |  | $ 39.4625 |  | $ 39.4625 |  |  |  |
2019 Convertible Notes [Member] | Convertible Senior Notes Due 2026 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from the sale of the notes |  |  |  | $ 212,900,000 |  |  |  |  |  |  |  |  |  |
Payment of convertible debt discounts and commissions |  |  |  | 6,600,000 |  |  |  |  |  |  |  |  |  |
Payment of convertible debt offering expenses |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |
Payments of transactions cost |  |  |  | 28,400,000 |  |  |  |  |  |  |  |  |  |
2019 Convertible Notes [Member] | Convertible Senior Notes Due 2026 [Member] | Exchange Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount converted |  |  |  |  |  |  | $ 126,100,000 |  |  |  |  |  |  |
2019 Convertible Notes [Member] | Convertible Senior Notes Due 2026 [Member] | Common Stock [Member] | Exchange Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount converted into shares | shares |  |  |  |  |  |  | 3,906,869 |  |  |  |  |  |  |
2020 Convertible Notes [Member] | Convertible Senior Notes Due 2026 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from the sale of the notes |  |  | $ 322,900,000 |  |  |  |  |  |  |  |  |  |  |
Payment of convertible debt discounts and commissions |  |  | 5,700,000 |  |  |  |  |  |  |  |  |  |  |
Payment of convertible debt offering expenses |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |
Payments of transactions cost |  |  | 43,100,000 |  |  |  |  |  |  |  |  |  |  |
2020 Convertible Notes [Member] | Convertible Senior Notes Due 2026 [Member] | Exchange Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount converted |  |  |  |  | $ 98,100,000 |  |  |  |  |  |  |  |  |
Convertible notes held in treasury |  |  |  |  |  |  |  | $ 425,400,000 |  | $ 425,400,000 |  |  |  |
2020 Convertible Notes [Member] | Convertible Senior Notes Due 2026 [Member] | Common Stock [Member] | Exchange Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount converted into shares | shares |  |  |  |  | 3,027,018 | 5,992,217 |  |  |  |  |  |  |  |
2019 and 2020 Convertible Notes [Member] | Convertible Senior Notes Due 2026 [Member] | Exchange Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount converted |  |  |  |  |  | $ 201,100,000 |  |  |  |  |  |  |  |
Capped Call Transactions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Volume-weighted average price per share | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 64.11 |  |
Call transactions remaining is a notional amount |  |  |  |  |  |  |  | $ 93,900,000 |  | $ 93,900,000 |  |  |  |
Proceeds from issuance of common stock |  | $ 98,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of counterparties | CounterParty |  |  |  |  |  |  |  |  |  |  |  |  |  | 2
Initial conversion price | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 39.4625
Initial cap price | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 63.14
Private Offering [Member] | 2019 Convertible Notes [Member] | Convertible Senior Notes Due 2026 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 220,000,000.0 |  |  |  |  |  |  |  |  |  |
Private Offering [Member] | 2020 Convertible Notes [Member] | Convertible Senior Notes Due 2026 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 300,000,000.0 |  |  |  |  |  |  |  |  |  |  |

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