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Equity Compensation Plans - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost $ 43,968 $ 42,383  
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) 586,762 569,728  
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) 498,223 431,072  
Number of stock awards granted (in shares) 206,179,000    
Number of stock awards vested (in shares) 117,725,000    
Number of stock awards forfeited (in shares) 21,303,000    
Deferred Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested outstanding stock awards (in shares) 4,526,420 4,022,088  
Number of stock awards granted (in shares) 645,870,000    
Number of stock awards vested (in shares) 1,965,990    
Stock units distributed (in shares) 141,538,000    
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    
Redwood Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock available for grant (in shares) 5,708,420 5,958,390  
Redwood Incentive Plan | Restricted Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost $ 13 $ 84  
Redwood Incentive Plan | Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost 5,360 3,589  
Redwood Incentive Plan | Deferred Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost 27,374 26,473  
Redwood Incentive Plan | Performance Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost $ 10,979 $ 12,237