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Share Based Compensation Plan - Additional Information (Detail) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) $ / shares
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Share based compensation expense | $ 4,714 |  | $ 1,454 | $ 1,519
Unrecognized share based compensation expense | $ 855 | $ 855 |  |
Share based compensation cost expected period for recognition | 8 years 11 months 23 days |  |  |
Option granted contractual term | 10 years |  |  |
Stock options vesting period | 3 years |  |  |
Weighted average grant date fair value | (per share) | $ 9.58 | $ 9.58 | $ 3.22 | $ 2.09
Aggregate Intrinsic value exercised | $ 1,999 |  | $ 2,162 | $ 219
Selling, General and Administrative Expenses [Member] |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Share based compensation expense | $ 4,714 |  | $ 1,454 | $ 1,519
Stock Compensation Plan [Member] |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |
Number of shares available for issuance | shares | 2,074,000 | 2,074,000 |  |
Maximum percentage of outstanding shares | 10.00% |  |  |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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=116856206&loc=d3e5070-113901 + Details
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