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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Schedule of Debt Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items]    
Total debt investments $ 637,466 $ 302,707
Cash and cash equivalents    
Debt and Equity Securities, FV-NI [Line Items]    
Total debt investments 174,585 18,001
Cash and cash equivalents | Level 1 | Money market funds    
Debt and Equity Securities, FV-NI [Line Items]    
Total debt investments 174,585 12,009
Cash and cash equivalents | Level 2 | Commercial paper and certificates of deposit    
Debt and Equity Securities, FV-NI [Line Items]    
Total debt investments 0 5,992
Short-term investments    
Debt and Equity Securities, FV-NI [Line Items]    
Total debt investments 462,881 284,706
Short-term investments | Level 1 | U.S. government securities    
Debt and Equity Securities, FV-NI [Line Items]    
Total debt investments 42,132 56,835
Short-term investments | Level 2 | U.S. agency securities    
Debt and Equity Securities, FV-NI [Line Items]    
Total debt investments 25,744 9,530
Short-term investments | Level 2 | Commercial paper and certificates of deposit    
Debt and Equity Securities, FV-NI [Line Items]    
Total debt investments 0 4,466
Short-term investments | Level 2 | Corporate bonds    
Debt and Equity Securities, FV-NI [Line Items]    
Total debt investments 392,585 213,875
Short-term investments | Level 2 | Asset-backed securities    
Debt and Equity Securities, FV-NI [Line Items]    
Total debt investments $ 2,420 $ 0