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REVENUE FROM CONTRACTS WITH CUSTOMERS (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregated Revenue Information [Abstract]    
Revenue $ 43,732 $ 24,348
Mainland China [Member]    
Disaggregated Revenue Information [Abstract]    
Revenue 43,696 24,289
Oher Regions [Member]    
Disaggregated Revenue Information [Abstract]    
Revenue 36 59
Single Wafer Cleaning, Tahoe and Semi-Critical Cleaning Equipment [Member]    
Disaggregated Revenue Information [Abstract]    
Revenue 32,413 22,784
ECP (Front-end and Packaging), Furnace and Other Technologies [Member]    
Disaggregated Revenue Information [Abstract]    
Revenue 5,550 0
Advanced Packaging (Excluding ECP), Services & Spares [Member]    
Disaggregated Revenue Information [Abstract]    
Revenue 5,769 1,564
Wet Cleaning and Other Front-end Processing Tools [Member]    
Disaggregated Revenue Information [Abstract]    
Revenue 31,900 22,784
Advanced Packaging, Other Back-end Processing Tools, Services and Spares [Member]    
Disaggregated Revenue Information [Abstract]    
Revenue $ 11,832 $ 1,564