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Stock Options and Restricted Stock - Summary of Activity for Stock Option 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] |  |  |  |  |
Number of options beginning balance |  | 550,040 |  | 144,666 | 320,626
Granted |  | 444,557 |  | 449,450 | 39,000
Cancelled |  | (42,928) |  | (44,076) | (214,960)
Exercised | [1] | 0 |  | 0 | 0
Number of options ending balance |  | 951,669 | [2] | 550,040 | 144,666
Options exercisable |  | 178,307 | [2] | 62,778 | 81,889
Exercise price per share, lower range limit beginning balance |  | $ 2.14 |  | $ 2.14 | $ 7.10
Exercise price per share, upper range limit beginning balance |  | 13.84 |  | 13.84 | 13.84
Exercise price per share, exercised | [1] | 0 |  | 0 | 0
Exercise price per share, lower range limit ending balance |  | 2.14 | [2] | 2.14 | 2.14
Exercise price per share, upper range limit ending balance |  | 13.53 | [2] | 13.84 | 13.84
Exercise price per share, option exercisable lower range limit |  | 2.14 | [2] | 2.14 | 7.10
Exercise price per share, option exercisable upper range limit |  | 13.53 | [2] | 13.84 | 13.84
Weighted average exercise price, beginning balance |  | 6.58 |  | 7.23 | 8.78
Weighted average exercise price, granted |  | 6.24 |  | 6.61 | 5.46
Weighted average exercise price, cancelled |  | 6.91 |  | 9.00 | 9.22
Weighted average exercise price, exercised | [1] | 0 |  | 0 | 0
Weighted average exercise price, ending balance |  | 6.41 | [2] | 6.58 | 7.23
Weighted average exercise price, options exercisable |  | 6.33 | [2] | 7.60 | 9.25
Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exercise price per share, granted |  | 5.21 |  | 5.27 | 2.14
Exercise price per share, cancelled |  | 6.55 |  | 9.22 | 10.76
Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Exercise price per share, granted |  | 7.25 |  | 5.58 | 2.61
Exercise price per share, cancelled |  | $ 13.84 |  | $ 9.24 | $ 11.21
[1] | The aggregate intrinsic value, which represents the difference between the price of the Company’s common stock at the exercise date and the related exercise price of the underlying options, was $0 for 2020, 2019, and 2018.
[2] | 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.

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