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SIGNIFICANT ACCOUNTING POLICIES - Revenue recognition - Primary Geographical Market (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2022
USD ($)
segment
Mar. 31, 2021
USD ($)
Disaggregation of Revenue [Line Items]    
Number of Operating Segments | segment 1  
Number of Reportable Segments | segment 1  
Total revenues $ 136,958 $ 100,606
Greater China    
Disaggregation of Revenue [Line Items]    
Total revenues [1] 43,041 39,614
United States    
Disaggregation of Revenue [Line Items]    
Total revenues 19,782 8,053
All other countries    
Disaggregation of Revenue [Line Items]    
Total revenues [2] $ 74,135 $ 52,939
[1] Greater China is inclusive of Mainland China, Hong Kong and Taiwan
[2] No single country included in the other countries’ category generated more than 10% of total revenue