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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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