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Principal Accounting Policies - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]      
Total revenues $ 133,256 $ 141,538 $ 160,670
PRC      
Disaggregation of Revenue [Line Items]      
Total revenues 68,590 79,193 91,671
United States      
Disaggregation of Revenue [Line Items]      
Total revenues 24,106 22,849 22,736
Others      
Disaggregation of Revenue [Line Items]      
Total revenues $ 40,560 $ 39,496 $ 46,263