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Income Taxes (Details) - Schedule of deferred tax assets - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Deferred tax assets: |  |
Net operating loss carry-forwards | $ 28,484 | $ 22,521
Allowance for doubtful accounts and inventory provision | 3,443 | 3,323
Product warranty | 2,903 | 2,762
Impairment of property, plant and equipment | 821 | 673
Deferred income | 216 | 227
Accrued expense | 805 | 736
Others | 615 | 615
Less: valuation allowance | (37,287) | (30,857)
Net deferred tax assets |  |

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