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SHARE-BASED COMPENSATION - Narrative (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 USD ($) shares | Feb. 28, 2024 shares | Apr. 06, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares reserved for future issuance (in shares) | 30,946,677 |  |  |
Shares issued during the period (in shares) | 15,261 | 7,549 |  |
Number of common stock issued per vesting RSU (in shares) | 1 |  |  |
Number of common stock issued per CSR (in shares) |  |  |  | 1.2082
Effective exchange ratio of Foamix ordinary shares into Menlo common stock |  |  |  | 1.8006
Weighted average remaining contractual term of outstanding options | 8 years 10 months 6 days |  |  |
Weighted average remaining contractual term of exercisable options | 5 years 8 months 26 days |  |  |
Unrecognized share based compensation expense, options | $ | $ 2,300,000 |  |  |
Aggregate intrinsic value of options outstanding | $ | 0 |  |  |
Aggregate intrinsic value of exercisable options | $ | $ 0 |  |  |
RSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares reserved for future issuance (in shares) | 460,979 |  |  |
Fair value of options and RSUs granted | $ | $ 2,400,000 | $ 800,000 |  |
Share-based payment cost not yet recognized, weighted average period of recognition (in years) | 3 years 10 months 17 days |  |  |
Share-based payment cost, RSUs outstanding, weighted average period or recognition (in years) | 2 years 1 month 28 days |  |  |
Unrecognized share-based compensation cost | $ | $ 2,300,000 |  |  |
Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based payment cost not yet recognized, weighted average period of recognition (in years) | 3 years 1 month 17 days |  |  |
Employees and consultants | Foamix |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Incremental compensation costs incurred | $ | $ 46,000 | $ 200,000 |  |
Common stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares reserved for future issuance (in shares) | 744,537 |  |  |
2023 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares reserved for future issuance (in shares) | 1,129,856 |  |  |
2019 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares reserved for future issuance (in shares) | 0 |  |  |
2018 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares reserved for future issuance (in shares) | 0 |  |  |
ESPP |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares reserved for future issuance (in shares) | 101,202 |  |  |
Percentage of fair market value used as purchase price | 85.00% |  |  |
Percent of annual earnings that may be used to purchase shares | 15.00% |  |  |
2024 Inducement Plan | Subsequent Event |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares reserved for future issuance (in shares) |  |  | 500,000 |

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