Debt - Narrative (Details) $ / shares in Units, $ in Thousands			3 Months Ended	12 Months Ended
	Oct. 20, 2023 USD ($)	Mar. 25, 2021 $ / shares shares	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) tradingDay businessDay	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Apr. 05, 2021 USD ($)	Oct. 20, 2020 USD ($)
Debt Instrument [Line Items]
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents				$ 124,972	$ 151,000	$ 242,246	$ 718,281
Repayments of senior debt				(106,953)	(241,808)	(83,614)
Gain on extinguishment of convertible senior notes				12,000	94,019	57,193
Adjustments to additional paid in capital, convertible debt, capped call transaction				62,647
Repayments of convertible debt				0	23,512	0
Payments of debt issuance costs				$ 2,482	2,338	$ 0
Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Conversion price, percentage				98.00%
2025 notes
Debt Instrument [Line Items]
Long-Term Debt, Fair Value				$ 69,933	164,113
2027 notes
Debt Instrument [Line Items]
Long-Term Debt, Fair Value				388,594	325,927
Senior Notes \| 2025 notes
Debt Instrument [Line Items]
Aggregate Principal Amount				73,759	193,445				$ 661,250
Long-Term Debt				73,516	192,002
Senior Notes \| 2027 notes
Debt Instrument [Line Items]
Aggregate Principal Amount				503,106	503,106			$ 575,000
Common stock covered under capped calls (in shares) \| shares		6,147,900
Long-Term Debt				$ 498,691	496,735
Senior Notes \| Convertible Senior Notes \| Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Threshold trading days \| tradingDay				20
Threshold consecutive trading days \| tradingDay				30
Threshold percentage of stock price trigger				130.00%
Senior Notes \| Convertible Senior Notes \| Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Threshold trading days \| businessDay				5
Threshold consecutive trading days \| tradingDay				5
Senior Notes \| Minimum \| 2027 notes \| Call Option \| Capped Call Transaction
Debt Instrument [Line Items]
Strike and cap price (in dollars per share) \| $ / shares		$ 93.53
Senior Notes \| Maximum \| 2027 notes \| Call Option \| Capped Call Transaction
Debt Instrument [Line Items]
Strike and cap price (in dollars per share) \| $ / shares		$ 138.56
Line of Credit
Debt Instrument [Line Items]
Repayments of convertible debt	$ 57,075
Payments of debt issuance costs	2,471
Payments of financing costs				$ 4,820
Line of Credit \| 2025 notes
Debt Instrument [Line Items]
Principal	5,000
Line of Credit \| 2027 notes
Debt Instrument [Line Items]
Principal	71,894
Line of Credit \| First Lien Term Loan Facility
Debt Instrument [Line Items]
Borrowing Capacity	$ 250,000
Redemption price, percent	101.00%
Long-term debt term	5 years
Cash and cash equivalent required	$ 75
Interest rate	11.43%
Proceeds from Lines of Credit			$ 125,000
Line of Credit Facility, Remaining Borrowing Capacity	$ 125,000
Line of Credit \| First Lien Term Loan Facility \| Period 3 \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	5.25%
Line of Credit \| First Lien Term Loan Facility \| Period 1 \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	5.75%
Line of Credit \| First Lien Term Loan Facility \| Period 2 \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	5.50%
Secured Debt \| Term Loan
Debt Instrument [Line Items]
Aggregate Principal Amount				247,500	124,688
Unamortized Debt Discount				2,571	0
Unamortized Debt Issuance Costs				1,585	272
Long-Term Debt				$ 243,344	$ 124,416

Redfin Corp 10-K