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Income Taxes (Details) - Schedule of deferred tax assets - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Deferred tax assets: |  |
Net operating loss carry-forwards | $ 38,858 | $ 28,484
Allowance for doubtful accounts and inventory provision | 4,712 | 3,443
Product warranty | 8,769 | 2,903
Impairment of property, plant and equipment | 1,210 | 821
Deferred income | 392 | 216
Accrued expense | 239 | 805
Others | 920 | 615
Less: valuation allowance | (55,100) | (37,287)
Net deferred tax assets |  |

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