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RELATED PARTY BALANCES AND TRANSACTIONS (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Related Party Transaction [Abstract] |  |  |
Accounts payable | $ 4,510 |  | $ 4,093
Purchase of materials | 7,240 | $ 2,211 |
Service fee charged by | 142 | 46 |
Ninebell Co., Ltd [Member] |  |  |
Related Party Transaction [Abstract] |  |  |
Prepaid expenses | 1,778 |  | 1,607
Accounts payable | 2,925 |  | 2,898
Purchase of materials | 6,882 | 2,153 |
Service fee charged by | 0 | 0 |
Shengyi Semiconductor Technology Co., Ltd [Member] |  |  |
Related Party Transaction [Abstract] |  |  |
Accounts payable | 1,585 |  | $ 1,195
Purchase of materials | 358 | 58 |
Service fee charged by | $ 142 | $ 46 |

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