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Income Taxes - Significant components of the deferred tax assets (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Deferred tax assets |  |  |  |
Net accumulated losses-carry forward | $ 114,958 | $ 103,231 | $ 76,944 |
Payroll liabilities | 2,451 | 2,915 | 5,438 |
Credit-related impairment of long-term investments | 1,421 |  |  |
Inventory write-downs | 531 | 691 | 402 |
Receivables allowances | 279 | 42 | 171 |
Other deductible temporary difference | 106 | 88 | 9 |
Less: valuation allowance | $ (119,746) | $ (106,967) | $ (82,964) | $ (37,405)

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