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Fair Value Measurements - Summary of Reconciliation of Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Convertible Security        
Change in fair value recognized in earnings $ 1,100,000 $ 0 $ 7,600,000 $ 0
Embedded derivative | Level 3        
Embedded Derivative        
Balance at beginning of period     5,680,000  
Addition related to the issuance of term loans in February 2021     5,630,000  
Extinguishment of term loans in February 2021     (1,130,000)  
Change in fair value recognized in earnings     7,640,000  
Settlement     (17,820,000)  
Balance at end of period 0   0  
Convertible security        
Convertible Security        
Change in fair value recognized in earnings (1,800,000)      
Convertible security | Level 3        
Convertible Security        
Balance at beginning of period     46,500,000  
Addition related to the issuance of term loans in February 2021     0  
Extinguishment of term loans in February 2021     0  
Change in fair value recognized in earnings     2,500,000  
Settlement     0  
Balance at end of period $ 49,000,000   $ 49,000,000