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SHARE-BASED COMPENSATION - Narrative (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jul. 22, 2021 shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 $ / shares | Dec. 31, 2019 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation costs not yet recognized | $ |  | $ 59,534 |  |
Weighted-average remaining period of compensation costs not yet recognized |  | 1 year 2 months 8 days |  |
Fair value of options granted (in USD per share) | $ / shares |  | $ 9.76 | $ 2.75 | $ 0.63
Ordinary shares - Class A |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares reserved for issuance (in shares) |  | 4,628,524 |  |
Percentage of shares issued and outstanding, approved for issuance |  | 0.02 |  |
2021 Plan | Ordinary shares - Class A |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares reserved for issuance (in shares) |  | 23,142,623 |  |
Ordinary shares | 2011 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares canceled (in shares) | 2,128,978 |  |  |
Share-based Payment Arrangement, Option |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  | 3 years |  |
Award expiration period |  | 10 years |  |
Minimum percentage of fair market value for exercise price of options granted |  | 1 |  |
Share-based Payment Arrangement, Option | 2011 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares authorized under plan (in shares) |  | 0 |  |
Options and RSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares available for future grant under plan (in shares) |  | 22,880,155 |  |
Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation costs not yet recognized | $ |  | $ 2,064 |  |
Weighted-average remaining period of compensation costs not yet recognized |  | 2 years 10 months 24 days |  |
Fair value of units granted (in USD per share) | $ / shares |  | $ 4.35 |  |

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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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