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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Schedule of loss before provision for income taxes |
|  | Year Ended December 31,
|  | 2018 |  | 2019 |  | 2020
Domestic |  | $ | (4,965 | ) |  | $ | (3,030 | ) |  | $ | (3,584 | )
Foreign |  |  | (49,301 | ) |  |  | (56,444 | ) |  |  | (30,040 | )
Loss before income tax |  | $ | (54,266 | ) |  | $ | (59,474 | ) |  | $ | (33,624 | )
Schedule of current and deferred components of the income tax expense |
|  | Year Ended December 31,
|  | 2018 |  | 2019 |  | 2020
Current tax expenses: |  |  |  |  |  |  |  |  |
Domestic |  | $ | 453 |  | $ | — |  | $ | —
Foreign |  |  | 85 |  |  | 189 |  |  | 1
Total current tax expense |  |  | 538 |  |  | 189 |  |  | 1
Deferred tax expense: |  |  |  |  |  |  |  |  |
Domestic |  |  | 2,856 |  |  | — |  |  | —
Foreign |  |  | 3,031 |  |  | — |  |  | —
Total deferred tax expense |  |  | 5,887 |  |  | — |  |  | —
Total provision for income taxes |  | $ | 6,425 |  | $ | 189 |  | $ | 1
Schedule of deferred tax assets |
|  | December 31, 2019 |  | December 31, 2020
Deferred tax assets: |  |  |  |  |  |  |  |
Net operating loss carry-forwards |  | $ | 22,521 |  |  | $ | 28,484 |
Allowance for doubtful accounts and inventory provision |  |  | 3,323 |  |  |  | 3,443 |
Product warranty |  |  | 2,762 |  |  |  | 2,903 |
Impairment of property, plant and equipment |  |  | 673 |  |  |  | 821 |
Deferred income |  |  | 227 |  |  |  | 216 |
Accrued expense |  |  | 736 |  |  |  | 805 |
Others |  |  | 615 |  |  |  | 615 |
Less: valuation allowance |  |  | (30,857 | ) |  |  | (37,287 | )
Net deferred tax assets |  | $ | — |  |  | $ | — |
Schedule of valuation allowance |
|  | Year Ended December 31,
|  | 2018 |  | 2019 |  | 2020
Balance at beginning of the period |  | $ | 1,822 |  |  | $ | 19,503 |  |  | $ | 30,857 |
Additions |  |  | 18,102 |  |  |  | 11,649 |  |  |  | 7,402 |
Reversal |  |  | (421 | ) |  |  | (295 | ) |  |  | (972 | )
Balance at end of the period |  | $ | 19,503 |  |  | $ | 30,857 |  |  | $ | 37,287 |
Schedule of reconciliation between the income tax expense |
|  | Year Ended December 31,
|  | 2018 |  | 2019 |  | 2020
Loss before income tax |  | $ | (54,266 | ) |  | $ | (59,474 | ) |  | $ | (33,624 | )
Tax credit at the U.S. federal corporate income tax rate of 21% |  |  | (11,396 | ) |  |  | (12,490 | ) |  |  | (7,061 | )
Tax effect of permanent differences |  |  | (4,033 | ) |  |  | (2,961 | ) |  |  | (2,152 | )
Tax effect of income tax rate difference in other jurisdictions |  |  | 3,417 |  |  |  | 4,076 |  |  |  | 2,511 |
Changes in valuation allowance |  |  | 17,943 |  |  |  | 11,669 |  |  |  | 6,702 |
Others |  |  | 494 |  |  |  | (105 | ) |  |  | 1 |
Income tax expense |  | $ | 6,425 |  |  | $ | 189 |  |  | $ | 1 |

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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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