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INCOME TAXES - Schedule of Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Deferred tax assets: |  |  |  |
Net operating loss carry-forwards | $ 54,459 | $ 38,858 |  |
Allowance for doubtful accounts and inventory provision | 3,311 | 4,712 |  |
Product warranty | 6,309 | 8,769 |  |
Impairment of property, plant and equipment | 1,367 | 1,210 |  |
Deferred income | 334 | 392 |  |
Accrued expense | 235 | 239 |  |
Others | 838 | 920 |  |
Less: valuation allowance | (66,853) | (55,100) | $ (37,287) | $ (30,857)
Net deferred tax assets | $ 0 | $ 0 |  |

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