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Equity Compensation Plans - Unrecognized Compensation Cost (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Unrecognized compensation cost at beginning of period	$ 27,664
Equity grants	5,270
Equity grant forfeitures	(1,143)
Equity compensation expense	(2,886)
Unrecognized Compensation Cost at End of Period	28,905
Redwood Incentive Plan | Restricted Stock Awards
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Unrecognized compensation cost at beginning of period	564
Equity grants	0
Equity grant forfeitures	(2)
Equity compensation expense	(167)
Unrecognized Compensation Cost at End of Period	395
Redwood Incentive Plan | Restricted Stock Units
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Unrecognized compensation cost at beginning of period	3,540
Equity grants	2,370
Equity grant forfeitures	(591)
Equity compensation expense	(307)
Unrecognized Compensation Cost at End of Period	5,012
Redwood Incentive Plan | Deferred Stock Units
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Unrecognized compensation cost at beginning of period	17,766
Equity grants	2,641
Equity grant forfeitures	(550)
Equity compensation expense	(1,761)
Unrecognized Compensation Cost at End of Period	18,096
Redwood Incentive Plan | Performance Stock Units
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Unrecognized compensation cost at beginning of period	5,794
Equity grants	0
Equity grant forfeitures	0
Equity compensation expense	(586)
Unrecognized Compensation Cost at End of Period	5,208
Employee Stock Purchase Plan
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized [Roll Forward]
Unrecognized compensation cost at beginning of period	0
Equity grants	259
Equity grant forfeitures	0
Equity compensation expense	(65)
Unrecognized Compensation Cost at End of Period	$ 194

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- Definition

Allocated Share-based Compensation Expense, Including Restructuring

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- Definition

Represents the amount of equity grant forfeitures during the period.

+ References

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- Definition

Amount of cost capitalized for 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 (h)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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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

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