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Notes and Securities Payable (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 29, 2021
Jan. 07, 2021
Oct. 05, 2020
Mar. 21, 2017
Oct. 31, 2017
Mar. 31, 2017
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Sep. 25, 2020
Dec. 27, 2018
Debt Instrument [Line Items]                            
Debt principal balance                     $ 424,752      
Initial obligation interest rate                         8.00%  
Extinguishment of debt                 $ 126,795 $ 0        
Amortization of debt discount                   14,900        
Interest expense             $ 413 $ 9,268 2,817 $ 25,560 35,990 $ 23,155    
Capitalized debt issuance cost             $ 100   $ 100   100      
Debt Instrument, Interest Rate Period One                            
Debt Instrument [Line Items]                            
Embedded derivative, discount rate             75.00%   75.00%          
Debt Instrument, Interest Rate Period Two                            
Debt Instrument [Line Items]                            
Embedded derivative, discount rate             55.00%   55.00%          
Seek Insurance Services, Inc. (Seek)                            
Debt Instrument [Line Items]                            
Interest expense             $ 400   $ 1,200   0 0    
Effective interest rate             8.20% 8.20% 8.20% 8.20%        
Convertible Debt Securities                            
Debt Instrument [Line Items]                            
Interest expense                   $ 22,000        
Effective interest rate inclusive of amortization               90.30%   90.30%        
Non Convertible Notes Payable                            
Debt Instrument [Line Items]                            
Debt principal balance       $ 60,000             $ 30,800 $ 49,300    
Amount drawn from loan facility       $ 40,000   $ 40,000                
Initial obligation interest rate       11.00% 11.25%                  
Additional amount under loan facility         $ 20,000                  
Extinguishment of debt $ 20,700                          
Payments of accrued interest $ 200                          
Effective interest rate                     11.78% 11.77%    
2015 Senior Secured Note                            
Debt Instrument [Line Items]                            
Proceeds to pay obligations and working capital       $ 30,000   $ 30,000                
Convertible Securities                            
Debt Instrument [Line Items]                            
Debt principal balance   $ 2,600                 $ 76,500 $ 373,800    
Capital contribution for extinguishment of debt   126,800                        
Aggregate principal amount   74,600                        
Fair value of embedded derivative liability   44,800                        
Unamortized discount   13,000                 337,300      
Convertible Securities | Debt Instrument, Interest Rate Period One                            
Debt Instrument [Line Items]                            
Initial obligation interest rate             6.50%   6.50%          
Convertible Securities | Debt Instrument, Interest Rate Period Two                            
Debt Instrument [Line Items]                            
Initial obligation interest rate             13.50%   13.50%          
Convertible Securities | Tranche One                            
Debt Instrument [Line Items]                            
Debt instrument, accrued interest   400                        
Convertible Securities | Other Tranche                            
Debt Instrument [Line Items]                            
Debt instrument, accrued interest   $ 7,400                        
Convertible Securities | Common Class Z                            
Debt Instrument [Line Items]                            
Debt instrument, redeemed and converted, shares issued (in shares)   36,117,708                        
Debt instrument, redeemed, shares issued (in shares)   34,806,921                        
Debt instrument conversion, shares issued (in shares)   1,310,787                        
Convertible Securities | Common Class B                            
Debt Instrument [Line Items]                            
Debt instrument conversion, shares issued (in shares)   74,694,107                        
Convertible Securities | Qualified Public Offering                            
Debt Instrument [Line Items]                            
Charge to account for dilution     9.40%                      
Convertible Securities | Maximum                            
Debt Instrument [Line Items]                            
Convertible debt, borrowing capacity                           $ 500,000
Convertible Debt | Subsidiary Issuer                            
Debt Instrument [Line Items]                            
Debt principal balance             $ 19,900   $ 19,900   19,900      
Aggregate principal amount                         $ 20,000  
2020 Convertible Note                            
Debt Instrument [Line Items]                            
Unamortized debt issuance cost             $ 100   $ 100   $ 100 0    
2020 Convertible Note | Seek Insurance Services, Inc. (Seek)                            
Debt Instrument [Line Items]                            
Debt principal balance                       $ 20,000    
Initial obligation interest rate                         8.00%