SHARE-BASED COMPENSATION - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) shares	Dec. 31, 2023 USD ($) shares	Apr. 06, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)	31,866,948
Shares issued during the period (in shares)	14,080	15,261
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 grant date fair value | $	$ 1,600	$ 1,200
Weighted average remaining contractual term of outstanding options	8 years 7 months 13 days
Weighted average remaining contractual term of exercisable options	7 years 21 days
Unrecognized share based compensation expense, options | $	$ 1,900
Aggregate intrinsic value of options outstanding | $	1,300
Aggregate intrinsic value of exercisable options | $	$ 134
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)	750,715
Fair value of options and RSUs granted | $	$ 2,600	2,400
Share-based payment cost not yet recognized, weighted average period of recognition (in years)	3 years 1 month 9 days
Share-based payment cost, RSUs outstanding, weighted average period or recognition (in years)	1 year 6 months 7 days
Unrecognized share-based compensation cost | $	$ 1,800
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 9 months 3 days
Employees and consultants | Foamix
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental compensation costs incurred | $	$ 7	$ 46
2023 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Further increase shares available for grant	1,520,000
Shares reserved for future issuance (in shares)	1,574,557
2024 Inducement Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)	1
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)	87,122
Percentage of fair market value used as purchase price	85.00%
Percent of annual earnings that may be used to purchase shares	15.00%