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Convertible Senior Notes - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 19, 2019 | Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Jul. 31, 2019
Debt Instrument [Line Items] |  |  |  |  |  |
Accretion of the debt discount |  |  | $ 8,592 | $ 8,175 |  |
Repayment of convertible debt |  |  | 9 |  |  |
Repayment of convertible debt |  |  | $ 9 |  |  |
0.375% Convertible Senior Notes due 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Notes issued | $ 287,500 |  |  |  |  | $ 287,500
Notes, interest rate | 0.375% |  |  |  |  |
Proceeds from issuance of convertible senior notes, net of costs | $ 278,500 |  |  |  |  |
Interest repayment terms |  |  | Interest is payable semi-annually in arrears on January 15 and July 15 of each year, beginning on January 15, 2020. |  |  |
Notes, due date | Jul. 15, 2024 |  |  |  |  |
Contractual coupon interest |  | $ 300 | $ 800 |  |  |
Accretion of the debt discount |  | 2,500 | 7,500 |  |  |
Amortization of the debt issuance costs |  | $ 400 | $ 1,100 |  |  |
Effective interest rate on the Notes |  | 5.10% | 5.10% |  |  |
Notes, carrying value |  | $ 252,300 | $ 252,300 |  | $ 243,700 |
Fair value of the note |  | 732,900 | 732,900 |  | $ 501,000 |
Additional Notes issued | $ 37,500 |  |  |  |  |
Debt instrument amount convertible into equity |  | 6,000 | 6,000 |  |  |
Loss on conversion of debt included in other expenses |  | $ 1,000 | $ 6,000 |  |  |
Excess common stock price percentage |  | 130.00% |  |  |  |

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