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Bank Loans - Schedule of Aggregate Maturities of Loans (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
Aggregate annual principal payments of loans payable  
Within 1 year $ 3,099
In 2023 365
In 2024 1,577
In 2025 2,524
After 2025 8,202
Total $ 15,767