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STOCK-BASED COMPENSATION PLAN - Schedule of Share-based Payment Arrangement, Option and RSU Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Options Outstanding |  |  |
Options outstanding at beginning of period (in shares) | 5,732,422 | 3,099,438 |
Options granted (in shares) | 1,454,549 | 3,271,856 |
Options exercised (in shares) | (2,496,070) | (108,999) |
Options forfeited (in shares) | (894,371) | (529,873) |
Options outstanding at end of period (in shares) | 3,796,530 | 5,732,422 | 3,099,438
Options vested and exercisable (in shares) | 1,827,374 | 2,825,238 |
Weighted average exercise price |  |  |
Weighted average exercise price of options outstanding at beginning of period (in USD per share) | $ 0.30 | $ 0.25 |
Weighted average exercise price of options granted (in USD per share) | 1.75 | 0.33 |
Weighted average exercise price of options exercised (in USD per share) | 0.27 | 0.06 |
Weighted average exercise price of options forfeited (in USD per share) | 0.46 | 0.29 |
Weighted average exercise price of options outstanding at end of period (in USD per share) | 0.83 | 0.30 | $ 0.25
Weighted average exercise price of options vested and exercisable (in USD per share) | $ 0.31 | $ 0.26 |
Options, Additional Disclosures |  |  |
Weighted average remaining contractual term of options outstanding | 8 years 29 days | 8 years 2 months 23 days | 7 years 9 months 25 days
Weighted average remaining contractual term of options vested and exercisable | 7 years 2 months 12 days | 7 years 2 months 15 days |
Aggregate intrinsic value of options outstanding | $ 40,274 | $ 4,333 | $ 821
Aggregate intrinsic value of options vested and exercisable | $ 20,337 | $ 2,215 |
Previously Reported |  |  |
Options Outstanding |  |  |
Options outstanding at beginning of period (in shares) |  | 2,104,223 |
Options outstanding at end of period (in shares) |  |  | 2,104,223
Weighted average exercise price |  |  |
Weighted average exercise price of options outstanding at beginning of period (in USD per share) |  | $ 0.37 |
Weighted average exercise price of options outstanding at end of period (in USD per share) |  |  | $ 0.37
Options, Additional Disclosures |  |  |
Weighted average remaining contractual term of options outstanding |  |  | 7 years 9 months 25 days
Aggregate intrinsic value of options outstanding |  |  | $ 821
Retroactive application of recapitalization |  |  |
Options Outstanding |  |  |
Options outstanding at beginning of period (in shares) |  | 995,215 |
Options outstanding at end of period (in shares) |  |  | 995,215
Weighted average exercise price |  |  |
Weighted average exercise price of options outstanding at beginning of period (in USD per share) |  | $ (0.12) |
Weighted average exercise price of options outstanding at end of period (in USD per share) |  |  | $ (0.12)
Restricted Stock Units |  |  |
Restricted Stock Units |  |  |
Units granted (in shares) | 3,392,153 |  |
Units outstanding at end of period (in shares) | 3,392,153 |  |
Weighted average grant date fair value per Share |  |  |
Weighted average grant date fair value per share of units granted (in USD per share) | $ 10.69 |  |
Weighted average grant date fair value per share of units outstanding at end of period (in USD per share) | $ 10.69 |  |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit 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 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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