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Bank Borrowings (Details) - USD ($) $ in Thousands | 12 Months Ended |
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Dec. 31, 2021 | Mar. 31, 2022
Bank Borrowings (Details) [Line Items] |  |
Debt instrument term, description | The original terms of the loans from Chinese banks range from 4 to 12 months and the interest rates range from 3.80% to 6.00% per annum. |
Loan balance | $ 13,301 |
Bank facility agreement, description | the German bank includes a $13,013 (EUR11 million) 8-year maturity term loan and a $4,732 (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 $4,732 (EUR4 million) revolving facility at 6.00% annual interest, needs to be renewed every year (60 days in advance). During the year ended December 31, 2021, the Group drew down the 8-year maturity term loan to the amount of $9,660. |
Minimum [Member] |  |
Bank Borrowings (Details) [Line Items] |  |
Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate |  | 3.80%
Maximum [Member] |  |
Bank Borrowings (Details) [Line Items] |  |
Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate |  | 6.00%

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- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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