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Equity Compensation Plans - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost |  | $ 26,488 | $ 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 |
Number of shares purchased by employees (in shares) |  | 546,093 | 489,886
Restricted Stock Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested outstanding stock awards (in shares) |  | 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) |  | 445,183 | 282,424
Number of stock awards granted (in shares) |  | 272,261,000 |
Number of stock awards vested (in shares) |  | 64,759,000 |
Number of stock awards forfeited (in shares) |  | 44,743,000 |
Deferred Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested outstanding stock awards (in shares) |  | 3,318,540 | 2,805,144
Number of stock awards granted (in shares) |  | 700,552,000 |
Number of stock awards vested (in shares) |  | 1,546,724 | 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 | 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) |  | 7,273,676 | 7,957,891
Redwood Incentive Plan | Restricted Stock Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost |  | $ 187 | $ 564
Redwood Incentive Plan | Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost |  | 4,052 | 3,540
Redwood Incentive Plan | Deferred Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost |  | 17,301 | 17,766
Redwood Incentive Plan | Performance Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost |  | $ 4,864 | $ 5,794

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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