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Share Based Compensation Plan - Summary Of Stock Option (Detail) | 12 Months Ended
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Dec. 31, 2019 USD ($) shares | Dec. 31, 2019 $ / shares shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2018 $ / shares shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2017 $ / shares shares | Dec. 31, 2016 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted Average Remaining Contractual Term (years), Beginning balance | 10 years |  |  |  |  |  |
Weighted Average Remaining Contractual Term (years), Ending balance | 10 years |  |  |  |  |  |
Stock Option [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of Options, Beginning balance | shares | 2,164,999 |  | 2,337,732 |  | 2,116,065 |  |
Number of Options, Granted | shares | 510,000 |  | 203,000 |  | 320,000 |  |
Number of Options, Excercised | shares | (212,332) |  | (365,733) |  | (91,667) |  |
Number of Options, Forfeited/expired | shares | (10,001) |  |  |  | (6,666) |  |
Number of Options, Forfeited | shares |  |  | (10,000) |  |  |  |
Number of Options, Ending balance | shares | 2,452,666 |  | 2,164,999 |  | 2,337,732 |  | 2,116,065
Number of Options, Excercisable | shares |  | 1,707,337 |  | 1,648,670 |  | 1,752,739 |
Weighted Average Exercise Price, Beginning balance | $ / shares |  | $ 2.10 |  | $ 1.59 |  | $ 1.19 |
Weighted Average Exercise Price, Granted | $ / shares |  | 16.32 |  | 5.79 |  | 4.04 |
Weighted Average Exercise Price, Exercised | $ / shares |  | 1.29 |  | 0.98 |  | 0.90 |
Weighted Average Exercise Price, Forfeited/expired | $ / shares |  |  |  |  |  | 1.48 |
Weighted Average Exercise Price, Forfeited | $ / shares |  | 2.20 |  | 1.48 |  |  |
Weighted Average Exercise Price, Ending balance | $ / shares |  | 5.12 |  | 2.10 |  | 1.59 | $ 1.19
Weighted Average Exercise Price, Excercisable | $ / shares |  | $ 1.78 |  | $ 1.43 |  | $ 1.20 |
Weighted Average Remaining Contractual Term (years), Beginning balance | 5 years 7 months 6 days |  | 5 years 8 months 8 days |  | 5 years 10 months 20 days |  | 6 years 2 months 26 days
Weighted Average Remaining Contractual Term (years), Granted | 9 years 2 months 8 days |  | 9 years 5 months 8 days |  | 9 years 8 months 15 days |  |
Weighted Average Remaining Contractual Term (years), Exercised | 4 years 10 months 6 days |  | 2 years 8 months 4 days |  | 4 years 1 month 2 days |  |
Weighted Average Remaining Contractual Term (years), Ending balance | 5 years 7 months 6 days |  | 5 years 8 months 8 days |  | 5 years 10 months 20 days |  | 6 years 2 months 26 days
Weighted Average Remaining Contractual Term (years), Exercisable | 4 years 2 months 4 days |  | 4 years 8 months 26 days |  | 4 years 10 months 9 days |  |
Aggregate Intrinsic Value, Ending balance | $ | $ 11,435 |  | $ 5,553 |  | $ 14,125 |  |
Aggregate Intrinsic Value, Excercisable | $ | $ 10,736 |  | $ 5,012 |  | $ 11,295 |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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)-(4) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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