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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 6 Months Ended
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Jun. 30, 2022
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |
Schedule of restricted cash and cash equivalents | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31, | ​
​ |  | 2022 |  | 2021 |
Cash and cash equivalents |  | $ | 44,669 |  | $ | 114,573 | ​
Restricted cash - current | ​ | ​ | 5,643 | ​ | ​ | 5,643 | ​
Restricted cash - noncurrent | ​ |  | 315 | ​ |  | 315 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash, cash equivalents and restricted cash |  | $ | 50,627 |  | $ | 120,531 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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- Definition Tabular disclosure of supplemental cash flow information for the periods presented. + References No definition available. + Details
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