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FAIR VALUE MEASUREMENTS - Schedule of Financial Instruments Measured at Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Liabilities      
Convertible preferred stock warrant liability $ 161,486 $ 95,342  
Total liabilities 161,486 95,342  
Money market fund      
Assets      
Cash equivalents 67 67  
Recurring      
Liabilities      
Total liabilities   95,342 $ 6,880
Recurring | Money market fund      
Assets      
Cash equivalents   67 67
Level 1      
Liabilities      
Convertible preferred stock warrant liability 0 0  
Total liabilities 0 0  
Level 1 | Money market fund      
Assets      
Cash equivalents 67 67  
Level 1 | Recurring | Money market fund      
Assets      
Cash equivalents   67 67
Level 2      
Liabilities      
Convertible preferred stock warrant liability 0 0  
Total liabilities 0 0  
Level 2 | Money market fund      
Assets      
Cash equivalents 0 0  
Level 3      
Liabilities      
Convertible preferred stock warrant liability 161,486 95,342  
Total liabilities 161,486 95,342  
Level 3 | Money market fund      
Assets      
Cash equivalents $ 0 0  
Level 3 | Recurring      
Liabilities      
Total liabilities   $ 95,342 $ 6,880