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BUSINESS COMBINATIONS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |
Purchase of businesses |  | $ 3,459 | $ 58,853
Wavecell Pte. Ltd. |  |  |
Business Acquisition [Line Items] |  |  |
Cash held back to cover indemnity claims | $ 10,400 |  |
Equity held back to cover indemnity claims (in shares) | 394,515 |  |
Equity held back to cover indemnity claims | $ 8,500 |  |
Purchase of businesses | $ 3,500 |  |
Issuance of common stock related to acquisitions (in shares) | 116,505 |  |

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