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FAIR VALUE OF FINANCIAL INSTRUMENTS - NARRATIVE (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Feb. 28, 2021
tranche
Feb. 28, 2021
segment
Convertible notes        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Total loss due to changes in fair value $ (514,700) $ (1,890,752)    
Warrant liability        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Total loss due to changes in fair value $ (13,400) $ (129,569)    
Convertible notes        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Number of tranches issued | tranche     2  
Convertible notes | Investor        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Number of tranches issued     2 2