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CASH AND CASH EQUIVALENTS AND RESTRICTED CASH (Tables) | 12 Months Ended
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Dec. 31, 2020
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH |
Schedule of reconciliation of cash and cash equivalents, and restricted cash | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020 | ​ | December 31, 2019
Cash and cash equivalents | ​ | $ | 20,843 | ​ | $ | 46,452
Restricted cash - non-current (Note 18) | ​ | ​ | 3,595 | ​ | ​ | 48
Total cash, cash equivalents, and restricted cash | ​ | $ | 24,438 | ​ | $ | 46,500

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