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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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