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Stockholders' Equity and Members Units Including Redeemable Convertible Class P Units - Narrative (Details) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 27, 2021 shares | Sep. 22, 2021 USD ($) director | Dec. 31, 2020 USD ($) | Dec. 31, 2021 shares | Jun. 30, 2021 | Sep. 22, 2021 USD ($) director | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Special distribution to members | $ |  |  | $ 10,000,000 |  |  |  |  | $ 10,000,000 |
Special distribution to members | $ |  |  |  |  |  |  |  | 20,000,000 |
Increase (decrease) in redeemable convertible preferred units to redemption value | $ |  |  |  |  |  | $ (327,189,000) | $ (327,189,000) | 8,499,000 | $ (18,250,000)
Increase/decrease | $ |  |  |  |  |  |  | $ 6,331,000 | 0 | 0
Preferred stock, shares issued (in shares) |  |  |  | 0 |  |  | 0 |  |
Stock options exercised (in shares) |  |  |  | 0 |  |  |  |  |
Tax distributions to members | $ |  |  |  |  |  |  | $ 21,441,000 | 0 | 0
Temporary equity, redemption | $ |  | $ 389,200,000 |  |  |  | $ 389,227,000 | $ 389,227,000 |  |
Member Units |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Special distribution to members | $ |  |  | $ 20,000,000 |  |  |  |  | 20,000,000 |
RSUs |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares withheld for tax withholding obligation (in shares) |  |  |  | 3,138 |  |  | 1,613 |  |
Brilliant Earth, LLC |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock issued during period, shares, new issues (in shares) |  |  |  | 9,583,332 |  |  |  |  |
LLC Units Converted Into Class A And Class D Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Conversion ratio | 1 |  |  | 1 |  |  | 1 |  |
Brilliant Earth, LLC |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Economic interest percent |  |  |  |  |  |  | 10.10% |  |
Noncontrolling interest, ownership percentage |  |  |  | 89.90% |  |  | 89.90% |  |
Class A Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Ratio of common Stock held to number of LLC interests held |  |  |  | 1 |  |  | 1 |  |
Common stock, shares issued (in shares) |  |  |  | 9,614,523 |  |  | 9,614,523 |  |
Common stock, shares outstanding (in shares) |  |  |  | 9,614,523 |  |  | 9,614,523 |  |
Conversion of stock, shares issued (in shares) |  |  |  | 28,053 |  |  |  |  |
Common Class B And Class C |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Ratio of common Stock held to number of LLC interests held |  |  |  | 1 |  |  | 1 |  |
Common stock, shares issued (in shares) |  |  |  | 85,163,263 |  |  | 85,163,263 |  |
Class B Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  | 35,658,013 |  |  | 35,658,013 |  |
Common stock, shares outstanding (in shares) |  |  |  | 35,658,013 |  |  | 35,658,013 |  |
Stock issued during period, shares, new issues (in shares) | 36,064,421 |  |  | 144,031 |  |  |  |  |
Class C Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  | 49,505,250 |  |  | 49,505,250 |  |
Common stock, shares outstanding (in shares) |  |  |  | 49,505,250 |  |  | 49,505,250 |  |
Stock issued during period, shares, new issues (in shares) | 50,232,863 |  |  |  |  |  |  |  |
Class D Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  | 0 |  |  | 0 |  |
Common stock, shares outstanding (in shares) |  |  |  | 0 |  |  | 0 |  |
Class F Units |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Number of directors elected | director |  | 4 |  |  |  | 4 |  |  |
Allocation of net profit (loss) in excess of threshold | $ |  |  |  |  |  |  |  | 11,300,000 |
Class F Units | Member Units |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Special distribution to members | $ |  |  |  |  |  |  |  | 20,000,000 |
Class F and Class P Units |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Allocation of net profit (loss) in excess of threshold | $ |  |  |  |  |  | $ 14,000,000 |  | 10,300,000 |
Class P Units |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Conversion ratio |  |  |  | 1 |  |  | 1 |  |
Number of directors elected | director |  | 3 |  |  |  | 3 |  |  |
Special distribution to members | $ |  |  |  |  |  |  |  | 10,000,000 |
Cash settlement period |  |  |  |  |  |  | 2 years |  |
Increase (decrease) in redeemable convertible preferred units to redemption value | $ |  |  |  |  |  | $ 327,200,000 |  | $ (8,500,000) | $ 18,300,000
Class P and Class M Units |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Weighting percentage per method |  |  |  |  | 33.30% |  |  | 33.30% | 33.30%

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