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Stock Options and Restricted Stock - Summary of Activity for Unvested Options Outstanding (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Number Of Shares Roll Forward |  |  |
Number of options beginning balance | 487,262 |  |
Number of options, granted | 444,557 | 449,450 | 39,000
Number of options, cancelled | (20,630) |  |
Number of options, vested | (137,827) |  |
Number of options ending balance | 773,362 | 487,262 |
Exercise price per share beginning balance, Lower limit | $ 2.14 |  |
Exercise price per share beginning balance, Upper limit | 7.25 |  |
Exercise price per share, Granted, Lower limit | 4.89 |  |
Exercise price per share, Granted, Upper limit | 6.68 |  |
Exercise price per share, Cancelled, Lower limit | 6.55 |  |
Exercise price per share, Cancelled, Upper limit | 7.25 |  |
Exercise price per share, Vested, Lower limit | 2.14 |  |
Exercise price per share, Vested, Upper limit | 6.55 |  |
Exercise price per share ending balance, Lower limit | 4.89 | $ 2.14 |
Exercise price per share ending balance, Upper limit | 7.25 | 7.25 |
Weighted average exercise price | 6.45 |  |
Weighted average exercise price, granted | 6.24 |  |
Weighted average exercise price, cancelled | 6.76 |  |
Weighted average exercise price, vested | 6.05 |  |
Weighted average exercise price | $ 6.42 | $ 6.45 |

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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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