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SHARE-BASED COMPENSATION - Changes in outstanding share options (Details) | 12 Months Ended
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Dec. 31, 2022 Options $ / shares | Dec. 31, 2021 Options $ / shares | Dec. 31, 2020 Options $ / shares
Number of options |  |  |
Options at beginning of year | Options | 3,854,974 | 3,456,165 | 3,332,160
Granted | Options | 2,092,904 | 786,636 | 1,158,058
Exercised | Options | (275,055) | (110,738) | (426,575)
Forfeited | Options | (385,939) | (277,089) | (607,478)
Options outstanding at end of year | Options | 5,286,884 | 3,854,974 | 3,456,165
Options exercisable at end of year | Options | 2,457,312 | 2,246,011 | 1,834,542
Weighted average exercise price |  |  |
Options at beginning of year | $ / shares | $ 1.61 | $ 1.07 | $ 0.92
Granted | $ / shares | 5.76 | 3.75 | 1.32
Exercised | $ / shares | 0.77 | 0.91 | 0.44
Forfeited | $ / shares | 2.82 | 1.24 | 1.15
Options outstanding at end of year | $ / shares | 3.21 | 1.61 | 1.07
Options exercisable at end of year | $ / shares | $ 1.34 | $ 1.00 | $ 0.90

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