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FAIR VALUE MEASUREMENTS - Financial Assets and Liabilities Measured on a Recurring Basis (Details) - Recurring - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Assets:    
Assets, fair value $ 182,842 $ 181,470
Liabilities:    
Liabilities, fair value   675
Derivative liabilities for exit fee    
Liabilities:    
Liabilities, fair value   675
Level 1    
Assets:    
Assets, fair value 39,869 18,641
Liabilities:    
Liabilities, fair value   0
Level 1 | Derivative liabilities for exit fee    
Liabilities:    
Liabilities, fair value   0
Level 2    
Assets:    
Assets, fair value 142,973 162,829
Liabilities:    
Liabilities, fair value   0
Level 2 | Derivative liabilities for exit fee    
Liabilities:    
Liabilities, fair value   0
Level 3    
Assets:    
Assets, fair value 0 0
Liabilities:    
Liabilities, fair value   675
Level 3 | Derivative liabilities for exit fee    
Liabilities:    
Liabilities, fair value   675
Money market funds    
Assets:    
Assets, fair value 39,869 18,641
Money market funds | Level 1    
Assets:    
Assets, fair value 39,869 18,641
Money market funds | Level 2    
Assets:    
Assets, fair value 0 0
Money market funds | Level 3    
Assets:    
Assets, fair value 0 0
U.S. government-sponsored agency bonds    
Assets:    
Assets, fair value 53,098 102,093
U.S. government-sponsored agency bonds | Level 1    
Assets:    
Assets, fair value 0 0
U.S. government-sponsored agency bonds | Level 2    
Assets:    
Assets, fair value 53,098 102,093
U.S. government-sponsored agency bonds | Level 3    
Assets:    
Assets, fair value 0 0
U.S. treasury securities    
Assets:    
Assets, fair value 36,743 2,457
U.S. treasury securities | Level 1    
Assets:    
Assets, fair value 0 0
U.S. treasury securities | Level 2    
Assets:    
Assets, fair value 36,743 2,457
U.S. treasury securities | Level 3    
Assets:    
Assets, fair value 0 0
Commercial paper    
Assets:    
Assets, fair value 30,792 49,654
Commercial paper | Level 1    
Assets:    
Assets, fair value 0 0
Commercial paper | Level 2    
Assets:    
Assets, fair value 30,792 49,654
Commercial paper | Level 3    
Assets:    
Assets, fair value 0 0
Corporate bonds    
Assets:    
Assets, fair value 17,408  
Corporate bonds | Level 1    
Assets:    
Assets, fair value 0  
Corporate bonds | Level 2    
Assets:    
Assets, fair value 17,408  
Corporate bonds | Level 3    
Assets:    
Assets, fair value 0  
Asset-backed securities    
Assets:    
Assets, fair value 2,978 8,625
Asset-backed securities | Level 1    
Assets:    
Assets, fair value 0 0
Asset-backed securities | Level 2    
Assets:    
Assets, fair value 2,978 8,625
Asset-backed securities | Level 3    
Assets:    
Assets, fair value 0 $ 0
Yankee bonds    
Assets:    
Assets, fair value 1,954  
Yankee bonds | Level 1    
Assets:    
Assets, fair value 0  
Yankee bonds | Level 2    
Assets:    
Assets, fair value 1,954  
Yankee bonds | Level 3    
Assets:    
Assets, fair value $ 0