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Summary of Significant Accounting Policies - Additional Information (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 4 Months Ended 9 Months Ended 12 Months Ended
Jun. 16, 2021
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
$ / shares
Sep. 30, 2021
USD ($)
segment
$ / shares
Sep. 30, 2020
USD ($)
Sep. 30, 2022
USD ($)
Jan. 01, 2021
USD ($)
Dec. 31, 2020
USD ($)
Accounting Policies [Line Items]                      
Allowance of bad debt   $ 3,000       $ 3,000 $ 3,000       $ 900
Deferred revenue   7,800       7,800 7,800       $ 5,300
Revenue recognized       $ 5,300              
Income tax expense (benefit)   (393)     $ 0   (242) $ 0      
Advertising expense   4,100     2,400   11,900 6,700      
Political contributions   200     $ 300   500 $ 600      
Period of exchange agreement 180 days                    
Shares converted basis (in shares) | shares 1                    
Share-based compensation expense   $ 4,192       $ 23,600 $ 23,625        
Incremental expense     $ 4,100                
Number of operating segments | segment             1        
Number of reportable segments | segment             1        
Tax receivable agreement liabilities as percent of expected benefit   85.00%       85.00% 85.00%        
Tax receivable agreement, percent recorded in additional paid-in capital   15.00%       15.00% 15.00%        
Equity securities without readily determinable fair value   $ 3,000       $ 3,000 $ 3,000        
Operating lease, right-of-use asset   37,673       37,673 37,673     $ 43,300  
Operating lease liabilities   $ 46,069       $ 46,069 $ 46,069     $ 48,400  
Forecast                      
Accounting Policies [Line Items]                      
Revenue recognized                 $ 7,800    
Class V Common Stock                      
Accounting Policies [Line Items]                      
Common stock, par value (in dollars per share) | $ / shares $ 0.0001 $ 0.0001       $ 0.0001 $ 0.0001        
Class A Common Stock, $0.0001 par value per share                      
Accounting Policies [Line Items]                      
Common stock, par value (in dollars per share) | $ / shares   $ 0.0001       $ 0.0001 $ 0.0001        
Payment to continuing members as percent of amount of tax benefit   85.00%       85.00% 85.00%        
Class P Units                      
Accounting Policies [Line Items]                      
Nonvested award, cost not yet recognized   $ 5,000       $ 5,000 $ 5,000        
Nonvested award, period for recognition             2 years 2 months 12 days        
Share-based compensation expense   $ 700         $ 20,100        
Silver Spike | Legacy WMH Class A Unit holders                      
Accounting Policies [Line Items]                      
Percentage of voting interests held (over 50%)   50.00%       50.00% 50.00%