Notes and Securities Payable - Additional Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jan. 07, 2021
Oct. 05, 2020
Dec. 27, 2018
Oct. 31, 2017
Mar. 21, 2017
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Sep. 25, 2020
Feb. 21, 2019
Oct. 30, 2017
Debt Instrument [Line Items]                          
Aggregate principal amount from loan facility               $ 424,752,000          
Initial Obligation interest rate                     8.00%    
Amortization of debt issuance costs           $ 6,000 $ 34,000 34,000 $ 506,000        
Carrying value of the convertible securities               76,500,000          
Unamortized discount $ 13,000,000                        
Capitalized debt issuance cost           100,000   100,000          
Amortization of debt discount           13,700,000 5,700,000            
Interest expense           1,175,000 7,815,000 35,990,000 23,155,000        
Current portion of notes and securities payable           21,425,000   20,803,000 18,481,000        
Share based payment arrangement, intrinsic value of convertible securities           $ 6,500,000 $ 100,000 $ 5,800,000 1,300,000        
Seek Insurance Services, Inc. (Seek) [Member]                          
Debt Instrument [Line Items]                          
Effective interest rate           8.10% 0.00%            
Convertible securities Maturity Date           Sep. 25, 2023   Sep. 25, 2023          
Interest expense           $ 400,000 $ 0            
Date of purchase agreement           Sep. 25, 2020   Sep. 25, 2020          
Principal Borrowed           $ 20,000,000   $ 20,000,000   $ 20,000,000      
Current portion of notes and securities payable           $ 19,900,000   $ 19,900,000 $ 0        
Debt instrument, term of coversion feature, description           The outstanding principal and accrued but unpaid interest will convert into an equity interest in Seek if prior to maturity, repayment or conversion of the note: (1) the note holder elects to convert the note, (2) upon the closing of Seek’s next equity financing; or (3) upon consummation of an initial public offering of Seek’s common stock or a SPAC or reverse merger transaction with Seek.   The outstanding principal and accrued but unpaid interest will convert into a minority equity interest in Seek if prior to maturity, repayment or conversion of the note: (1) the note holder elects to convert the note, (2) upon the closing of Seek’s next equity financing; or (3) upon consummation of an initial public offering of Seek’s common stock or a SPAC or reverse merger transaction with Seek.          
Merger Agreement With S C H [Member]                          
Debt Instrument [Line Items]                          
Business combination, effective date of merger           Jan. 07, 2021              
Convertible Debt Securities [Member]                          
Debt Instrument [Line Items]                          
Carrying value of the convertible securities           $ 0              
Interest expense             $ 6,500,000            
Effective interest rate inclusive of amortization           100.00% 90.07%   100.00%        
Non Convertible Notes Payable [Member]                          
Debt Instrument [Line Items]                          
Aggregate principal amount from loan facility         $ 60,000,000                
Amount drawn from loan facility         $ 40,000,000                
Additional Amount Under Loan Facility       $ 20,000,000                  
Maturity Date of Initial Obligation       Mar. 01, 2022                  
Initial Obligation interest rate       11.25% 11.00%               11.30%
Maturity Date Of Additional Obligation       Oct. 01, 2022                  
Amortization of debt issuance costs         $ 300,000     $ 300,000 $ 400,000        
Carrying amount of the Loan Facility           $ 25,800,000   30,800,000 49,300,000        
Interest Expense Debt           $ 800,000 $ 1,300,000 $ 4,400,000 $ 6,200,000        
Effective interest rate           11.80% 11.80% 11.78% 11.77%        
2015 Senior Secured Note [Member]                          
Debt Instrument [Line Items]                          
Proceeds to Pay Obligations and Working Capital         $ 30,000,000                
Convertible Securities [Member]                          
Debt Instrument [Line Items]                          
Aggregate principal amount 74,600,000                        
Convertible securities Maturity Date     Apr. 01, 2023                    
Description of Embedded Derivative           The interest rate and embedded feature discount factor vary based on the length of time elapsed from the issue date of the securities. The interest rates begin at 6.5% for the first twelve-month period through the first anniversary of the security issue date, increasing ratably on a semi-annual basis, to 13.5% at the third anniversary of the security issue date until the convertible securities cease to be outstanding.   The interest rate and embedded feature discount factor vary based on the length of time elapsed from the issue date of the securities. The interest rates begin at 6.5% for the first twelve-month period through the first anniversary of the security issue date, increasing ratably on a semi-annual basis, to 13.5% at the third anniversary of the security issue date until the convertible securities cease to be outstanding.          
Description of Interest Rate Derivative Activities           The embedded feature discount factors begin at 75.0% for the first twelve-month period through the first anniversary of the security issue date, decreasing ratably on a semi-annual basis, to 55.0% at the forty-two month anniversary of the security issue date until the convertible securities cease to be outstanding   The embedded feature discount factors begin at 75% for the first twelve-month period through the first anniversary of the security issue date, decreasing ratably on a semi-annual bas          
Carrying value of the convertible securities 2,600,000                        
Unamortized discount               $ 337,300,000          
Capital contribution for extinguishment of debt 126,800,000                        
Fair value of embedded derivative liability               44,800,000          
Convertible Securities [Member] | Tranche One [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, accrued interest 400,000                        
Convertible Securities [Member] | Other Tranche [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, accrued interest $ 7,400,000                        
Convertible Securities [Member] | Common Class Z [Member]                          
Debt Instrument [Line Items]                          
Debt instrument conversion, shares issued 1,310,787                        
Debt instrument, redeemed and converted, shares issued 36,117,708                        
Debt instrument, redeemed, shares issued 34,806,921                        
Convertible Securities [Member] | Common Class B [Member]                          
Debt Instrument [Line Items]                          
Debt instrument conversion, shares issued 74,694,107                        
2020 Convertible Note [Member]                          
Debt Instrument [Line Items]                          
Unamortized debt issuance cost           $ 100,000   100,000 $ 0        
Bridge Loan [Member]                          
Debt Instrument [Line Items]                          
Interest Expense Debt               $ 0 400,000        
Effective interest rate     10.00%                    
Aggregate principal amount     $ 30,000,000                    
Carrying value of the convertible securities                       $ 30,400,000  
Date of purchase agreement     Dec. 27, 2018                    
Convertible Securities [Member]                          
Debt Instrument [Line Items]                          
Aggregate principal amount                 373,800,000        
Proceeds from convertible debt                 343,400,000        
Repayment of convertible debt                 30,400,000        
Debt conversion, description               Shares are calculated as principal and accrued interest divided by the applicable conversion price. Conversion price is the lowest of (i) the product obtained by multiplying (x) the lowest price per share at which the Corporation issued applicable preferred stock, by (y) the discount factor, and (ii) the lowest price per share at which the Corporation issued its most recently authorized series of preferred stock and (iii) a price per share equal to (x) $2.5 billion, divided by (y) the number of shares of common stock outstanding as of the conversion on an as-converted, as-exercised basis as defined in the Convertible Agreement.          
Terms of warrant repurchases calculation               Repurchase warrant share price is calculated as the lower of (a) lowest price at which the repurchase warrant shares were originally issued and (b) the quotient obtained by dividing (x) $2.5 billion, divided by (y) the number of shares of common stock outstanding as of the date of issuance of the applicable repurchase warrant on an as-converted, as-exercised basis as defined in the Convertible Agreement.          
Debt conversion extension terms               The Corporation may elect to extend the end date until the earlier of (i) a deemed liquidation event and (ii) the end of a period designated by the Corporation of not less than 15 days and not more than 180 days (if the security holder is an original security holder or an affiliate of the original security holder), or otherwise 365 days (if the security holder is not an original security holder or an affiliate of such security holder), following the original end date.          
Convertible Securities [Member] | Merger Agreement With S C H [Member]                          
Debt Instrument [Line Items]                          
Amortization of debt issuance costs               $ 0 0        
Interest Expense Debt               31,100,000          
Convertible securities Maturity Date   Apr. 01, 2023                      
Carrying value of the convertible securities   $ 0           76,500,000          
Unamortized discount   $ 373,800,000           337,300,000          
Amortization of debt discount               21,100,000          
Debt issuance costs                 $ 400,000        
Share based payment arrangement, intrinsic value of convertible securities               $ 2,300,000,000          
Qualified Public Offering [Member]                          
Debt Instrument [Line Items]                          
Charge to account for dilution   9.40%                      
Qualified Public Offering [Member] | Convertible Securities [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, term of coversion feature, description               pursuant to the terms of the Convertible Agreement based on a conversion price calculated as the lesser of (i) the price per share at which the Corporation’s equity securities are issued to the public in the applicable transaction multiplied by the discount factor in effect and (ii) a price per share equal to (x) $2.5 billion, divided by (y) the number of shares of common stock outstanding as of the closing of the applicable transaction on an as-converted, as-exercised basis as defined in the Convertible Agreement.          
Qualified Public Offering [Member] | Convertible Securities [Member] | Merger Agreement With S C H [Member]                          
Debt Instrument [Line Items]                          
Charge to account for dilution   9.35%