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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Concentration Risk [Line Items] |  |
Schedule of 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 | %
Customers |  |
Concentration Risk [Line Items] |  |
Schedule of significant customers |  | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Accounts Receivable | ​ | Revenue
​ | ​ | December 31, | ​ | Years Ended December 31,
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019
Customers: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Customer A |  | * |  | 45 | % | 12 | % | *
Customer B |  | 30 | % | * |  | * |  | *
Customer C |  | 20 | % | * |  | * |  | *
Customer D |  | 17 | % | * |  | 25 | % | *
* | Total less than 10% for the respective period

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