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Equity Compensation Plans - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost $ 27,207 $ 27,207 $ 27,664
Weighted average amortization period remaining for equity awards   1 year  
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)   523,991 489,886
Restricted Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested outstanding stock awards (in shares) 29,693 29,693 78,998
Number of stock awards granted (in shares)   0  
Number of stock awards vested (in shares)   49,305,000  
Number of stock awards forfeited (in shares)   0  
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested outstanding stock awards (in shares) 453,811 453,811 282,424
Number of stock awards granted (in shares)   272,261,000  
Number of stock awards vested (in shares)   62,494,000  
Number of stock awards forfeited (in shares)   38,380,000  
Deferred Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested outstanding stock awards (in shares) 3,081,201 3,081,201 2,805,144
Number of stock awards granted (in shares)   463,213,000  
Number of stock awards vested (in shares)   1,437,464 1,206,125
Number of stock awards forfeited (in shares)   31,161,000  
Stock units distributed (in shares)   155,995,000  
Performance Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested outstanding stock awards (in shares) 955,710 955,710 978,735
Share-based compensation, vesting period (in years)   3 years  
Adjustment for future amortization expense $ 1,000    
Redwood Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock available for grant (in shares) 7,443,250 7,443,250 7,957,891
Redwood Incentive Plan | Restricted Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost $ 291 $ 291 $ 564
Redwood Incentive Plan | Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost 4,548 4,548 3,540
Redwood Incentive Plan | Deferred Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost 16,728 16,728 17,766
Redwood Incentive Plan | Performance Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost $ 5,511 $ 5,511 $ 5,794