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Stock Compensation - Summary of Share-based Compensation Arrangements by Share-based Payment Award (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2021 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of options, Granted | 0 |  |
2017 EIP And 2021 EIP [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of options, Beginning |  | 1,855,507 |
Number of options, Granted |  | 1,188,064 |
Number of options, Exercised |  | (145,805) |
Number of options, Cancelled and forfeited |  | (3,095) |
Number of options, Ending |  | 2,894,671 | 1,855,507
Number of options, Options exercisable |  | 82,944 |
Number of options, Vested and expected to vest |  | 2,894,671 |
Weighted average exercise price, Opening balance |  | $ 2.99 |
Weighted average exercise price, Granted |  | 8.98 |
Weighted average exercise price, Exercised |  | 3.77 |
Weighted average exercise price, Cancelled and forfeited |  | 9.38 |
Weighted average exercise price, Ending balance |  | 5.43 | $ 2.99
Weighted average exercise price, Option exercisable |  | 3.42 |
Weighted average exercise price, Vested and expected to vest |  | $ 5.43 |
Weighted average remaining contractual term |  | 9 years 4 months 6 days | 9 years 9 months 14 days
Weighted average remaining contractual term, Options exercisable |  | 8 years 11 months 15 days |
Weighted average remaining contractual term, Vested and expected to vest |  | 9 years 4 months 6 days |
Intrinsic Value |  | $ 34,521 | $ 8
Intrinsic Value, Options exercisable |  | 1,155 |
Intrinsic Value, Vested and expected to vest |  | $ 34,521 |

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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=120381028&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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