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Stock Options and Restricted Stock - Additional Information (Detail) - USD ($) |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 15, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 01, 2016 | Feb. 29, 2016 | Jun. 16, 2006
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock option outstanding |  |  | 951,669 | [1] | 550,040 | 144,666 | 320,626 |  |  |
Stock option exercisable |  |  | 178,307 | [1] | 62,778 | 81,889 |  |  |  |
Unvested shares of common stock outstanding |  |  | 773,362 |  | 487,262 |  |  |  |  |
Weighted average fair value of options granted |  |  | $ 6.24 |  |  |  |  |  |  |
Intrinsic value of options vested |  |  | $ 45,000 |  | $ 43,000 | $ 32,000 |  |  |  |
Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares outstanding |  |  | 62,780 |  |  |  |  |  |  |
Number of shares, granted |  |  | 47,156 |  | 26,040 | 0 |  |  |  |
Restricted Stock Units [Member] | Vest on June 19, 2021 [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares outstanding |  |  | 47,156 |  |  |  |  |  |  |
Number of shares, granted |  |  | 47,156 |  |  |  |  |  |  |
Vesting period |  |  | 1 year |  |  |  |  |  |  |
Exercise price for grant per share |  |  | $ 3.16 |  |  |  |  |  |  |
Number of shares vested with deferred settlement |  |  | 16,524 |  |  |  |  |  |  |
Number of shares vested and settled |  |  | 10,416 |  |  |  |  |  |  |
Restricted Shares [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares outstanding |  |  | 416,140 | [2] | 284,879 | 190,915 | 408,582 |  |  |
Weighted average fair value of options granted |  |  | $ 3.09 |  | $ 3.10 | $ 1.06 |  |  |  |
Number of shares, granted |  |  | 229,408 |  | 216,148 | 101,010 |  |  |  |
Exercise price for grant per share |  |  | $ 6.21 |  | $ 6.59 | $ 4.41 |  |  |  |
Number of shares vested and settled | [3] |  | 89,392 |  | 118,238 | 308,940 |  |  |  |
2018 Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares available for grant |  | 241,919 | 2,210,968 |  |  |  |  |  |  |
Shares were rolled into the 2018 Plan |  |  | 862,069 |  |  |  |  |  |  |
2015 Restricted Stock Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares available for grant |  |  |  |  |  |  |  | 700,000 |  |
Unvested shares of common stock outstanding |  |  | 416,140 |  |  |  |  |  |  |
2006 Stock Option Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of maximum number of shares approved |  |  |  |  |  |  |  |  |  | 800,000
Number of additional shares available for issuance |  |  | 0 |  |  |  |  |  |  |
2006 Stock Option Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share based compensation, options term |  |  | 10 years |  |  |  |  |  |  |
2015 Director Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares available for grant |  | 258,334 |  |  |  |  |  |  | 300,000 |
2015 Director Plan [Member] | Non Employee Director One [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares available for grant |  | 12,000 |  |  |  |  |  |  |  |
2015 Director Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share based compensation, options term |  | 10 years |  |  |  |  |  |  |  |
Amended Director Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares available for grant |  |  | 200,000 |  |  |  |  |  |  |
Number of additional shares available for issuance |  |  | 0 |  |  |  |  |  |  |
Amended Director Plan [Member] | Director [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares available for grant |  |  | 9,000 |  |  |  |  |  |  |
Amended Director Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share based compensation, options term |  |  | 10 years |  |  |  |  |  |  |
[1] | The aggregate intrinsic value, which represents the difference between the price of the Company’s common stock at December 31, 2020 and the related exercise price of the underlying options, was $45,000 for outstanding options and $43,000 for exercisable options as of December 31, 2020. The remaining contractual life was 8.60 years for outstanding options and 7.23 years for exercisable options at December 31, 2020.
[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.
[3] | The aggregate fair value of the restricted stock vested was $579,000, $736,000, and $1,270,000 for 2020, 2019, and 2018.

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