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SHARE BASED COMPENSATION - Narrative (Details) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 12, 2021 contingentStockRight shares | Mar. 09, 2020 USD ($) contingentStockRight | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) contingentStockRight shares | Apr. 06, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of common stock issued per CSR (in shares) |  |  |  |  | 1.2082
Effective exchange ratio of Foamix ordinary shares into Menlo common stock |  |  |  |  | 1.8006
Additional paid in capital reclassified to derivate liabilities |  |  |  | $ 975,000 |
Weighted average remaining contractual term of outstanding options |  |  | 7 years |  |
Weighted average remaining contractual term of exercisable options |  |  | 5 years 6 months |  |
Unrecognized share based compensation expense, options |  |  | $ 6,400,000 |  |
Aggregate intrinsic value of options outstanding |  |  | 0 |  |
Aggregate intrinsic value of exercisable options |  |  | 0 |  |
Foamix |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of contingent stock rights issued (in CSR) | contingentStockRight |  | 1 |  |  |
RSU |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Fair value of options and RSUs granted |  |  | $ 9,400,000 | 11,900,000 |
Share-based payment cost not yet recognized, weighted average period of recognition (in years) |  |  | 2 years 3 months 7 days |  |
Unrecognized share-based compensation cost |  |  | $ 5,600,000 |  |
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) |  |  | 2 years 3 months 18 days |  |
Employees and consultants | Foamix |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Incremental compensation costs incurred |  |  | $ 1,800,000 | $ 11,800,000 |
Incremental compensation costs incurred |  |  | $ 900,000 |  |
Incremental compensation costs, recognition period |  |  | 1 year |  |
No longer employed or providing services | Foamix |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Incremental compensation costs incurred |  | $ 600,000 | $ 1,000,000 |  |
Additional paid in capital reclassified to derivate liabilities |  | $ 1,600,000 |  |  |
Common stock | Foamix |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of contingent stock rights issued (in CSR) | contingentStockRight |  | 1 |  |  |
Common stock | Foamix |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares issued during the period (in shares) | shares |  |  | 71,890 | 61,031 |
2019 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares reserved for future issuance (in shares) | shares |  |  | 979,795 |  |
2018 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares reserved for future issuance (in shares) | shares |  |  | 147,550 |  |
ESPP |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares reserved for future issuance (in shares) | shares |  |  | 2,232,207 |  |
Percentage of fair market value used as purchase price |  | 85.00% |  |  |
Percent of annual earnings that may be used to purchase shares |  | 15.00% |  |  |
ESPP | Common stock | Foamix |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock issued during the period, conversation units (in shares) | shares | 9,038 |  |  | 36,155 |
Number of contingent stock rights issued (in CSR) | contingentStockRight | 1 |  |  | 1 |
ESPP | Common stock | Menlo | Employees and consultants |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock issued during the period, conversation units (in shares) | shares |  |  | 38,716 |  |

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