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v3.21.2

Stockholders' Equity - Summary of Stock Option Activity (Detail) - $ / shares | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Weighted Average Exercise Price |  |  |  |  |
Beginning balance (in dollars per share) | $ 0.19 |  |  |  |
Ending balance (in dollars per share) |  | $ 0.19 |  |  |
Options to purchase common stock |  |  |  |  |
Outstanding Options |  |  |  |  |
Beginning balance (in shares) | 7,945,956 | 8,104,691 | 8,222,710 | 8,222,710 |
Granted (in shares) | 0 | 0 | 0 |  |
Exercised (in shares) | (6,215) | 0 | (118,019) |  |
Forfeited / canceled | 0 | (158,735) | 0 |  |
Ending balance (in shares) | 7,939,741 | 7,945,956 | 8,104,691 | 7,939,741 | 8,222,710
Vested and expected to vest (in shares) | 7,108,987 |  |  | 7,108,987 |
Weighted Average Exercise Price |  |  |  |  |
Beginning balance (in dollars per share) | $ 0.19 | $ 0.19 | $ 0.19 | $ 0.19 |
Granted (in dollars per share) |  |  | 0 |  |
Exercised (in dollars per share) | 0.36 |  | 0.46 |  |
Forfeited / canceled (in dollars per share) |  | 0.14 | 0 |  |
Ending balance (in dollars per share) | $ 0.19 | $ 0.19 | $ 0.19 | $ 0.19 | $ 0.19
Weighted Average Remaining Contractual Life (in years) |  |  |  |  |
Weighted Average Remaining Contractual Life (in years) | 7 years 6 months 10 days | 7 years 9 months 10 days | 8 years 21 days |  | 8 years 3 months 18 days

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- Definition 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. + 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) -URI http://asc.fasb.org/extlink&oid=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance 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)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. 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)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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