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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Foreign Currency Translation and Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES      
Foreign currency transaction losses $ (11.2) $ (4.1) $ (4.0)