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Equity Compensation Plans - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average amortization period remaining for equity awards |  |  | 1 year |
Reversal of stock-based compensation expense previously recorded |  | $ 1 |  |
Shares of common stock to be purchased in aggregate for all employees (in shares) |  |  | 600,000 |
Number of shares purchased by employees (in shares) |  |  | 477,142 | 430,772
Restricted Stock Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unvested outstanding stock awards (in shares) |  |  | 80,550 | 216,470
Number of stock awards granted (in shares) |  |  | 0 |
Number of stock awards vested (in shares) |  |  | 101,063 |
Number of stock awards forfeited (in shares) |  |  | 34,857 |
Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unvested outstanding stock awards (in shares) |  |  | 294,986 | 275,173
Number of stock awards granted (in shares) |  |  | 205,482 |
Number of stock awards vested (in shares) |  |  | 55,514 |
Number of stock awards forfeited (in shares) |  |  | 130,155 |
Deferred Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unvested outstanding stock awards (in shares) |  |  | 2,420,737 | 2,630,805
Number of stock awards granted (in shares) |  |  | 494,719 |
Number of stock awards vested (in shares) |  |  | 1,406,190 | 1,286,063
Number of stock awards forfeited (in shares) |  |  | 291,253 |
Stock units distributed (in shares) |  |  | 413,533 |
Performance Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unvested outstanding stock awards (in shares) |  |  | 739,895 | 839,070
Number of stock awards forfeited (in shares) |  |  | 99,175 |
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) |  |  | 8,629,455 | 3,637,480
Additional common stock authorized (in shares) | 5,000,000 |  |  |

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- Definition Maximum amount of shares of common stock permitted to be purchased for all employees under the Employee Stock Purchase Plan. + References No definition available. + Details
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- Definition Amount of shares of common stock purchased by employees under the Employee Stock Purchase Plan in the current period. + References No definition available. + 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 Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -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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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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