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CASH EQUIVALENTS AND MARKETABLE SECURITIES - Summary of cost and estimated fair value of short-term investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]    
Maturing in one year or less $ 359,775 $ 510,094
Maturing after one year through five years 49,205 50,530
Total $ 408,980 $ 560,624