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OTHER LONG-TERM LIABILITIES (Tables) | 6 Months Ended
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Jun. 30, 2021
OTHER LONG-TERM LIABILITIES |
Schedule of other long-term liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, 2021 |  | December 31, 2020
Technology Investment Agreement (TIA) |  | $ | 50,445,187 |  | $ | 22,444,324
Stock repurchase |  | ​ | 1,016,452 |  | ​ | 2,034,373
Total | ​ | $ | 51,461,639 | ​ | $ | 24,478,697

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