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Stock Options and Restricted Stock - Summary of Activity for Restricted Stock Programs (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Grant price per share, cancelled, lower limit |  | $ 2.14 |  |  |
Grant price per share, cancelled, upper limit |  | $ 6.55 |  |  |
Restricted Shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares, beginning balance |  | 284,879 |  | 190,915 | 408,582
Number of shares, granted |  | 229,408 |  | 216,148 | 101,010
Number of shares, cancelled |  | (8,755) |  | (3,946) | (9,737)
Number of shares, vested | [1] | (89,392) |  | (118,238) | (308,940)
Number of shares, ending balance |  | 416,140 | [2] | 284,879 | 190,915
Grant price per share, lower range limit beginning balance |  | $ 3.95 |  | $ 2.14 | $ 2.06
Grant price per share, upper range limit beginning balance |  | 7.25 |  | 5.27 | 10.38
Grant price per share, granted, lower limit |  | 4.89 |  | 4.80 | 3.93
Grant price per share, granted, upper limit |  | 6.68 |  | 7.25 | 5.27
Grant price per share, cancelled, lower limit |  | 3.95 |  | 3.93 | 3.93
Grant price per share, cancelled, upper limit |  | 7.25 |  | 6.55 | 9.08
Grant price per share, vested, lower limit | [1] | 3.95 |  | 2.06 | 2.06
Grant price per share, vested, upper limit | [1] | 6.55 |  | 4.80 | 10.38
Grant price per share, lower range limit ending balance |  | 4.39 | [2] | 3.95 | 2.14
Grant price per share, upper range limit ending balance |  | 7.25 | [2] | 7.25 | 5.27
Weighted average grant price beginning balance |  | 6.01 |  | 4.06 | 3.45
Weighted average grant price, granted |  | 6.21 |  | 6.59 | 4.41
Weighted average grant price, cancelled |  | 6.93 |  | 4.97 | 4.66
Weighted average grant price, vested | [1] | 5.37 |  | 3.89 | 3.35
Weighted average grant price, ending balance |  | $ 6.24 | [2] | $ 6.01 | $ 4.06
[1] | The aggregate fair value of the restricted stock vested was $579,000, $736,000, and $1,270,000 for 2020, 2019, and 2018.
[2] | The aggregate fair value of the restricted stock was $2,039,000 as of December 31, 2020. The remaining vesting period was 2.03 years at December 31, 2020.

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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 Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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