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CASH EQUIVALENTS, INVESTMENTS AND FAIR VALUE MEASUREMENTS - Available for sale debt securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Cash and Cash Equivalents [Line Items]    
Short-term investments $ 241,807 $ 426,181
Long-term investments   91,588
Total investments 327,194 579,018
Money market funds    
Cash and Cash Equivalents [Line Items]    
Cash equivalents $ 85,387 $ 61,249