SHARE BASED COMPENSATION - Narrative (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($) shares	Jan. 31, 2022 shares	Apr. 06, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)	593,625
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	6 years 6 months
Weighted average remaining contractual term of exercisable options	5 years 6 months
Unrecognized share based compensation expense, options | $	$ 2,900,000
Aggregate intrinsic value of options outstanding | $	0
Aggregate intrinsic value of exercisable options | $	$ 0
RSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)	83,616
Fair value of options and RSUs granted | $	$ 800,000	$ 9,400,000
Share-based payment cost not yet recognized, weighted average period of recognition (in years)	2 years 1 month 6 days
Unrecognized share-based compensation cost | $	$ 2,900,000
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 1 month 6 days
Employees and consultants | Foamix
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental compensation costs incurred | $	$ 200,000	$ 1,800,000
Incremental compensation costs incurred | $	$ 100,000
Incremental compensation costs, recognition period	1 year
Common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)	229,787
Common stock | Foamix
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during the period (in shares)	7,549	3,994
2019 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)	57,338
2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)	14,810
Increase in shares reserved for future issuance (in shares)			41,666
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)	116,463
Percentage of fair market value used as purchase price	85.00%
Percent of annual earnings that may be used to purchase shares	15.00%