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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Schedule of Debt Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items]    
Total debt investments $ 507,001 $ 438,533
Cash and Cash Equivalents    
Debt and Equity Securities, FV-NI [Line Items]    
Total debt investments 193,051 18,828
Cash and Cash Equivalents | Level 1 | Money market funds    
Debt and Equity Securities, FV-NI [Line Items]    
Total debt investments 193,051 18,828
Short-term Investments    
Debt and Equity Securities, FV-NI [Line Items]    
Total debt investments 313,950 419,705
Short-term Investments | Level 1 | U.S. government securities    
Debt and Equity Securities, FV-NI [Line Items]    
Total debt investments 24,067 37,805
Short-term Investments | Level 2 | U.S. agency securities    
Debt and Equity Securities, FV-NI [Line Items]    
Total debt investments 0 9,804
Short-term Investments | Level 2 | Corporate bonds    
Debt and Equity Securities, FV-NI [Line Items]    
Total debt investments 277,615 364,926
Short-term Investments | Level 2 | Asset-backed securities    
Debt and Equity Securities, FV-NI [Line Items]    
Total debt investments $ 12,268 $ 7,170