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Share-Based Compensation - Summary of Stock Options Outstanding under Plans (Detail) - 2013 and 2021 Plan - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Number of Shares (shares) | 61,000 | 111,000 | 115,938 | 125,938
Options Outstanding, Intrinsic Value | $ (274) |  |  |
Options Outstanding, Weighted-Average Exercise Price Per Share (in USD per share) | $ 22.73 | $ 19.89 | $ 19.58 | $ 19.59
Options Outstanding, Weighted-Average Remaining Contractual Life | 10 months 2 days |  |  |
Options Exercisable, Number of Shares (shares) | 61,000 | 111,000 | 115,938 |
Options Exercisable, Intrinsic Value | $ (274) |  |  |
Options Exercisable, Weighted-Average Exercise Price Per Share (in USD per share) | $ 22.73 | $ 19.89 | $ 19.58 |
Options Exercisable, Weighted-Average Remaining Contractual Life | 10 months 2 days |  |  |
Intrinsic value of stock options outstanding (in USD per share) | $ 19.4 |  |  |
$20.00 to $21.49 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Number of Shares (shares) | 3,000 |  |  |
Options Outstanding, Intrinsic Value | $ (7) |  |  |
Options Outstanding, Weighted-Average Exercise Price Per Share (in USD per share) | $ 20.64 |  |  |
Options Outstanding, Weighted-Average Remaining Contractual Life | 7 months 2 days |  |  |
Options Exercisable, Number of Shares (shares) | 3,000 |  |  |
Options Exercisable, Intrinsic Value | $ (7) |  |  |
Options Exercisable, Weighted-Average Exercise Price Per Share (in USD per share) | $ 20.64 |  |  |
Options Exercisable, Weighted-Average Remaining Contractual Life | 7 months 2 days |  |  |
$21.50 to $23.49 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Number of Shares (shares) | 55,000 |  |  |
Options Outstanding, Intrinsic Value | $ (247) |  |  |
Options Outstanding, Weighted-Average Exercise Price Per Share (in USD per share) | $ 22.73 |  |  |
Options Outstanding, Weighted-Average Remaining Contractual Life | 9 months 25 days |  |  |
Options Exercisable, Number of Shares (shares) | 55,000 |  |  |
Options Exercisable, Intrinsic Value | $ (247) |  |  |
Options Exercisable, Weighted-Average Exercise Price Per Share (in USD per share) | $ 22.73 |  |  |
Options Exercisable, Weighted-Average Remaining Contractual Life | 9 months 25 days |  |  |
$23.50 to $24.83 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Number of Shares (shares) | 3,000 |  |  |
Options Outstanding, Intrinsic Value | $ (20) |  |  |
Options Outstanding, Weighted-Average Exercise Price Per Share (in USD per share) | $ 24.83 |  |  |
Options Outstanding, Weighted-Average Remaining Contractual Life | 1 year 5 months 23 days |  |  |
Options Exercisable, Number of Shares (shares) | 3,000 |  |  |
Options Exercisable, Intrinsic Value | $ (20) |  |  |
Options Exercisable, Weighted-Average Exercise Price Per Share (in USD per share) | $ 24.83 |  |  |
Options Exercisable, Weighted-Average Remaining Contractual Life | 1 year 5 months 23 days |  |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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