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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2020
Summary of Significant Accounting Policies |
Schedule of restricted cash and cash equivalents | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31, | ​
​ |  | 2020 |  | 2019 |
Cash and cash equivalents |  | $ | 143,872 |  | $ | 155,889 | ​
Restricted cash - current | ​ | ​ | 35,492 | ​ | ​ | 6,045 | ​
Restricted cash - noncurrent | ​ |  | 315 | ​ |  | 315 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash, cash equivalents and restricted cash |  | $ | 179,679 |  | $ | 162,249 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Estimated Useful Lives of Fixed Assets |
Summary of Significant Accounting Policies |
Schedule of fixed assets, net | ​
​ | ​ | ​ | ​ | ​ | ​
Description |  | Useful lives
​ | ​ | ​ | ​ | ​ | ​
Leasehold improvements |  | Lesser of the estimated useful life of the asset or life of the lease
Furniture, fixtures & other equipment |  | 5 years
Vessel equipment |  | 2-15 years
Computer equipment |  | 3 years

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