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Stock-Based Awards - Summary of Information on Stock Options Outstanding and Exercisable (Detail) - $ / shares |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2002 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Options Outstanding & Exercisable, Shares | 305,000 | 305,000 | 485,536 | 570,537 | 1,158,828
Options Outstanding, Weighted Average Remaining Life | 3 months 18 days | 3 months 18 days |  |  |
Options Outstanding, Weighted Average Exercise Price |  | $ 5.68 | $ 4.80 | $ 4.36 | $ 2.75
$5.05 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Range of Exercise Prices |  | $ 5.05 |  |  |
Options Outstanding & Exercisable, Shares |  | 190,000 |  |  |
Options Outstanding, Weighted Average Remaining Life |  | 1 month 6 days |  |  |
Options Outstanding, Weighted Average Exercise Price |  | $ 5.05 |  |  |
$6.36 - $6.82 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Range of Exercise Prices, low |  | 6.42 |  |  |
Range of Exercise Prices, high |  | $ 6.82 |  |  |
Options Outstanding & Exercisable, Shares |  | 67,500 |  |  |
Options Outstanding, Weighted Average Remaining Life |  | 4 months 24 days |  |  |
Options Outstanding, Weighted Average Exercise Price |  | $ 6.47 |  |  |
$7.01 - $7.30 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Range of Exercise Prices, low |  | 7.01 |  |  |
Range of Exercise Prices, high |  | $ 7.30 |  |  |
Options Outstanding & Exercisable, Shares |  | 47,500 |  |  |
Options Outstanding, Weighted Average Remaining Life |  | 9 months 18 days |  |  |
Options Outstanding, Weighted Average Exercise Price |  | $ 7.07 |  |  |

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- Definition Number of options outstanding, including both vested and non-vested options. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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