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SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
12 Months Ended
Apr. 23, 2020
USD ($)
Dec. 31, 2020
USD ($)
derivativeInstruments
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Nov. 05, 2020
Apr. 06, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Number of derivative instruments held | derivativeInstruments   0        
Goodwill impairment loss   $ 4,500,000 $ 0 $ 0    
Provisions for doubtful accounts   0 0 0    
Number of common stock issued per CSR (in shares)           1.2082
Effective exchange ratio of Foamix ordinary shares into Menlo common stock (share/share)         0.5924 1.8006
In Process Research and Development            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
In process research and development impairment   $ 49,800,000 $ 0 $ 0    
Foamix            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Proceeds from royalties $ 10,000,000.0          
Additional royalty upon receipt of marketing approval in China $ 1,000,000.0