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SHARE-BASED COMPENSATION - Non-Employee Share options (Details) - Non-Employee Share options - $ / shares |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SHARE-BASED COMPENSATION |  |  |  |
Options outstanding (in shares) | 1,045,962 | 852,519 |  |
Options outstanding (in dollars per share) | $ 1.00 |  |  |
Share options vested (in shares) | 975,962 |  |  |
Share options granted (in shares) |  | 0 | 35,000 | 25,625
Exercise price of share options granted (in dollars per share) |  | $ 1.99 | $ 1.99 | $ 1.99
Share options exercised (in shares) |  | 254,068 |  |
Contractual term of options granted |  | 4 years | 4 years | 4 years
Percentage of stock awards vesting each year |  | 25.00% |  |
Vested and exercisable (in shares) |  | 810,957 |  |

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