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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) $ / shares | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) segment | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($)
Noncontrolling Interest [Line Items] |  |  |  |  |
Money market fund accounts included in cash equivalents | $ 33,500 |  | $ 33,500 |  | $ 71,600
Interest income | $ 800 | $ 1,600 | $ 3,200 | $ 4,600 |
Number of operating segments | segment |  |  | 1 |  |
Number of reportable segments | segment |  |  | 1 |  |
Dividends declared (in dollars per share) | $ / shares | $ 0.25 |  |  |  |
Dividends paid | $ 25,000 |  | $ 27,980 | $ 1,763 |
Brilliant Earth, LLC |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Noncontrolling interest, ownership percentage | 84.90% |  | 84.90% |  |

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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References No definition available. + Details
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