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Stock Plans - Additional Information (Detail) - USD ($) | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Employee Stock Purchase Plan [Member] |  |
Class of Stock [Line Items] |  |
Common stock were purchased under ESPP | 67,068 |
Accrued employee contributions | $ 119,000 |
Timebased Stock Option [Member] |  |
Class of Stock [Line Items] |  |
Options granted | 92,000 |
Stock Awards [Member] |  |
Class of Stock [Line Items] |  |
Unrecognized cost of share-based compensation awards | $ 0 |
Restricted Stock Units [Member] |  |
Class of Stock [Line Items] |  |
Unrecognized cost of share-based compensation awards | $ 16,840,000 |
Cost of share-based compensation awards, recognition period | 10 months 24 days |
Performance-based Stock Options [Member] |  |
Class of Stock [Line Items] |  |
Total grant date fair value of stock options granted | $ 0 | $ 0
Total grant date fair value of stock options vested |  | 0
Unrecognized compensation expense related to stock options | 16,268,000 |
Aggregate intrinsic value of the options exercised | $ 5,815,000 | 0
Stock Options [Member] |  |
Class of Stock [Line Items] |  |
Options granted | 92,000 |
Cost of share-based compensation awards, recognition period | 3 years |
Total grant date fair value of stock options vested | $ 733,000 | 2,371,000
Unrecognized compensation expense related to stock options | 7,765,000 |
Aggregate intrinsic value of the options exercised | $ 7,848,000 | $ 0
Weighted Average Grant Date Fair Value, Granted | $ 32.68 | $ 1.64

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- Definition Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for option under share-based payment arrangement. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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