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STOCK BASED COMPENSATION - Stock-based activities (Details) - ADSs - $ / shares | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
ADS Underlying Options |  |  |
Number of options outstanding at beginning of period | 1,440,664 |  |
Number of options outstanding at end of period | 1,108,159 |  | 1,440,664
Weighted Average Exercise Price |  |  |
Outstanding at beginning of the period | $ 16.8 |  |
Outstanding at the end of the period | $ 21.92 |  | $ 16.8
Amended plan |  |  |
ADS Underlying Options |  |  |
Number of options outstanding at beginning of period | 55,541 |  |
Granted | 124,514 | 0 |
Number of options outstanding at end of period | 180,055 |  | 55,541
Exercisable options (in shares) | 2,043 |  |
Weighted Average Exercise Price |  |  |
Outstanding at beginning of the period | $ 150.47 |  |
Granted | 9.07 |  |
Outstanding at the end of the period | 52.69 |  | $ 150.47
Exercisable options (in dollars per share) | $ 2,576.66 |  |
Weighted Average Contractual Terms |  |  |
Contractual term (in years) | 9 years 3 months 18 days |  | 9 years 9 months 3 days
Exercisable options (in years) | 7 years 10 months 17 days |  |

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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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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