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Equity Compensation Plans - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost   $ 38,624,000 $ 42,383,000  
Weighted average amortization period remaining for equity awards   2 years    
Shares of common stock to be purchased in aggregate for all employees (in shares)   850,000 850,000  
Number of shares purchased by employees (in shares) 569,728 607,877    
Restricted Stock Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested outstanding stock awards (in shares)   1,551 28,141  
Number of stock awards granted (in shares)   0    
Number of stock awards vested (in shares)   26,249,000    
Number of stock awards forfeited (in shares)   341    
Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested outstanding stock awards (in shares)   486,546 431,072  
Number of stock awards granted (in shares)   206,179,000    
Number of stock awards vested (in shares)   120,154,000    
Number of stock awards forfeited (in shares)   30,551,000    
Deferred Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested outstanding stock awards (in shares)   4,551,475 4,022,088  
Number of stock awards granted (in shares)   824,875,000    
Number of stock awards vested (in shares)   2,089,958 1,469,903  
Stock units distributed (in shares)   295,488,000    
Performance Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested outstanding stock awards (in shares)   1,267,849 1,473,883  
Number of stock awards granted (in shares)       206,034
Share-based compensation, vesting period (in years)   3 years    
Equity compensation expense   $ 2,000,000    
Redwood Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock available for grant (in shares)   5,551,039 5,958,390  
Redwood Incentive Plan | Restricted Stock Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost   $ 7,000 $ 84,000  
Redwood Incentive Plan | Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost   4,885,000 3,589,000  
Redwood Incentive Plan | Deferred Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost   25,041,000 26,473,000  
Redwood Incentive Plan | Performance Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost   $ 8,530,000 $ 12,237,000