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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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Number of options outstanding, including both vested and non-vested options.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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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.

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The ceiling 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.

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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.

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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.

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