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Operating Leases - Components of lease expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Lease cost:      
Amortization of right-of-use assets $ 4,100 $ 4,766 $ 6,981
Interest of lease liabilities 354 692 749
Expenses for short-term lease within 12 months 76 1,168 501
Total lease cost $ 4,530 $ 6,626 $ 8,231