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Summary of Restricted Stock Unit Activity (Detail) - Restricted Stock Units and Performance Stock Units - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
Options Outstanding |  |  |  |
Unvested at December 31, 2020 |  | 665,540 |  |
Awarded |  | 164,968 |  |
Vested |  | (185,922) |  |
Forfeited/expired/cancelled |  | (24,825) |  |
Unvested at September 31, 2021 |  | 619,761 | 665,540 | 675,567
Unvested and expected to vest at September 30, 2021 | [1] | 623,642 |  |
Weighted-Average Remaining Contractual Term (in years) |  |  |  |
Unvested at December 31, 2020 |  | 2 years 11 months 8 days | 3 years 3 months 25 days |
Unvested and expected to vest at June 30, 2021 | [1] | 2 years 7 months 9 days |  |
Aggregate Intrinsic Value |  |  |  |
Unvested at September 31, 2021 |  | $ 179,105 | $ 127,904 |
Unvested and expected to vest at September 30, 2021(1) | [1] | $ 180,226 |  |
[1] | Represents the number of vested options as of September 30, 2021 plus the number of unvested options expected to vest as of September 30, 2021 based on the unvested outstanding options at September 30, 2021 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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