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FAIR VALUE MEASUREMENTS - Financial instruments measured at fair value (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Mar. 31, 2021
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total liabilities $ 95,342 $ 161,486  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]      
Amount of asset transferred into level 3 0    
Amount of asset transferred out of level 3 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net [Abstract]      
Amount of liability transferred into level 3 0    
Amount of liability transferred out of level 3 0    
Money market fund      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 67 67  
Recurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Embedded derivative liabilities     $ 786
Total liabilities 95,342   6,880
Recurring | Outstanding convertible preferred stock warrants      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Convertible preferred stock warrant liabilities 95,342   6,094
Recurring | Money market fund      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 67   67
Level 1      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total liabilities 0 0  
Level 1 | Money market fund      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 67 67  
Level 1 | Recurring | Money market fund      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 67   67
Level 2      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total liabilities 0 0  
Level 2 | Money market fund      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 0 0  
Level 3      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total liabilities 95,342 161,486  
Level 3 | Money market fund      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 0 $ 0  
Level 3 | Recurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Embedded derivative liabilities     786
Total liabilities 95,342   6,880
Level 3 | Recurring | Outstanding convertible preferred stock warrants      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Convertible preferred stock warrant liabilities $ 95,342   $ 6,094