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Bank Borrowings (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Bank Borrowings (Details) [Line Items] |  |  |
Guarantee to secure certain loan | $ 21,838 | $ 20,874 | $ 32,607
Debt instrument term, description | The original terms of the loans from Chinese banks range from 6 to 12 months and the interest rates range from 5.00% to 6.00% per annum. |  |
Loan balance | $ 16,572 |  |
Bank facility agreement, description | the German bank includes a $13.0 million (EUR11 million) 8-year maturity term loan and a $4.7 million (EUR4 million) revolving facility (“German Bank Facility Agreement”). The interest rate of the 8-year maturity term loan is EURIBOR plus a margin rate determined by the financial leverage ratio of the Group. The $4.7 million (EUR4 million) revolving facility at 6% annual interest, needs to be renewed every year (60 days in advance). During the six months ended June 30, 2021, the Group drew down the 8-year maturity term loan at the amount of $9,886. |  |
Minimum [Member] |  |  |
Bank Borrowings (Details) [Line Items] |  |  |
Interest rate |  | 4.68% |
Maximum [Member] |  |  |
Bank Borrowings (Details) [Line Items] |  |  |
Interest rate |  | 5.66% |

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