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Recent Accounting Standards - Summary Impact of ASU 2020-06 on Opening Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | Jan. 01, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Deferred tax liabilities (assets) |  | $ 8,211 | $ 26
Convertible senior notes, net |  | 486,366 | 0
Additional paid-in capital |  | 763,051 | 593,583
Retained earnings |  | 575,965 | $ 583,489
Pre-ASU 2020-06 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Deferred tax liabilities (assets) |  | 8,211 |
Convertible senior notes, net |  | 486,366 |
Additional paid-in capital |  | 763,051 |
Retained earnings |  | $ 575,965 |
ASU 2020-06 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Deferred tax liabilities (assets) | $ (41,693) |  |
Convertible senior notes, net | 148,546 |  |
Additional paid-in capital | (107,810) |  |
Retained earnings | 957 |  |
As Adjusted |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Deferred tax liabilities (assets) | (33,482) |  |
Convertible senior notes, net | 634,912 |  |
Additional paid-in capital | 655,241 |  |
Retained earnings | $ 576,922 |  |

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