XML 63 R49.htm IDEA: XBRL DOCUMENT v3.21.2
Fair Value Measurements - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 09, 2021
Aug. 24, 2021
Jan. 08, 2021
Jan. 07, 2021
Dec. 31, 2020
Sep. 25, 2020
Dec. 31, 2017
Nov. 30, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                        
Exercise price of warrants (in dollars per share)         $ 0.10           $ 3.45 $ 2.61
Warrants outstanding $ 0   $ 0           $ 97,782,000      
Warrants outstanding (in shares)             38,533,271 38,533,271        
Private Placement Warrants                        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                        
Warrants outstanding           $ 0            
Warrants outstanding (in shares)           0            
Level 3                        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                        
Estimated fair value of convertible securities 0   0           949,600,000      
Financial asset or liabilities transfer in and out 0 $ 0 0 $ 0                
Level 3 | 2020 Convertible Note                        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                        
Estimated fair value of convertible securities                   $ 20,000,000    
Estimated fair value and carrying value of convertible securities $ 21,600,000   $ 21,600,000           $ 20,400,000