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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 3 Months Ended
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Mar. 31, 2021
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |
Significant Customers | ​
​ | ​ | Accounts Receivable | ​ | Revenue |
​ | ​ | March 31, | ​ | December 31, | ​ | Three Months Ended March 31, | ​
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 | ​
Customers: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Customer A | ​ | * | ​ | * | ​ | 14 | % | * | ​
Customer B | ​ | 15 | % | 30 | % | * | ​ | * | ​
Customer C | ​ | 13 | % | 20 | % | * | ​ | * | ​
Customer D | ​ | 36 | % | 17 | % | * | ​ | * | ​
Customer E | ​ | * | ​ | * | ​ | 39 | % | * | ​
Customer F | ​ | * | ​ | * | ​ | * | ​ | 16 | %

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