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Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 22, 2021 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Noncontrolling Interest [Line Items]
Fair value of units				$ 389,200
Restricted cash	$ 205	$ 205	$ 204
Impairment losses	$ 0	0	0
Return period	30 days
Resizing period	60 days
Extended service plan period	3 years
Deferred revenue	$ 19,000	11,000
Deferred revenue, noncurrent	200	200
Revenue recognized	9,600	8,100	5,900
Refund liability	2,338	2,341	1,339			$ 448
Refund assets	1,100	1,200
Marketing, advertising and promotional costs	74,400	47,100	57,100
Foreign currency transactions	$ 500	$ 300	$ 300
Software
Noncontrolling Interest [Line Items]
Estimated useful life	3 years
Minimum
Noncontrolling Interest [Line Items]
Third-party extended service plan period	2 years
Accounting Standards Update 2016-02 | Cumulative Effect, Period of Adoption, Adjustment | Minimum
Noncontrolling Interest [Line Items]
Operating lease assets (liabilities), net	$ 17,000
Accounting Standards Update 2016-02 | Cumulative Effect, Period of Adoption, Adjustment | Maximum
Noncontrolling Interest [Line Items]
Operating lease assets (liabilities), net	$ 20,000
Class P Units
Noncontrolling Interest [Line Items]
Warrant liability, fair value				$ 6,400	$ 100
Conversion ratio	1
Brilliant Earth, LLC
Noncontrolling Interest [Line Items]
Noncontrolling interest, ownership percentage	89.90%

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