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v3.21.1

RELATED PARTY - Narrative (Details) - Convertible Notes - Convertible Senior Notes Due 2023 - USD ($) | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2018 | Aug. 31, 2018
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Related Party Transaction [Line Items] |  |  |  |
Debt instrument face amount | $ 5,000,000.0 | $ 5,000,000.0 |  | $ 65,000,000.0
Thurman John Rodgers |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Debt instrument face amount | $ 5,000,000.0 | $ 5,000,000.0 | $ 5,000,000.0 |

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