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FAIR VALUE MEASUREMENTS - Schedule of Financial Instruments Measured at Fair Value (Details) - Fair Value, Recurring - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Public Warrants    
Liabilities    
Warrant liability $ 303,798  
Convertible Preferred Stock Warrant    
Liabilities    
Warrant liability   $ 95,342
Money market fund    
Assets    
Cash equivalents 225,795 67
Level 1 | Public Warrants    
Liabilities    
Warrant liability 303,798  
Level 1 | Convertible Preferred Stock Warrant    
Liabilities    
Warrant liability   0
Level 1 | Money market fund    
Assets    
Cash equivalents 225,795 67
Level 2 | Public Warrants    
Liabilities    
Warrant liability 0  
Level 2 | Convertible Preferred Stock Warrant    
Liabilities    
Warrant liability   0
Level 2 | Money market fund    
Assets    
Cash equivalents 0 0
Level 3 | Public Warrants    
Liabilities    
Warrant liability 0  
Level 3 | Convertible Preferred Stock Warrant    
Liabilities    
Warrant liability   95,342
Level 3 | Money market fund    
Assets    
Cash equivalents $ 0 $ 0