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SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
derivativeInstruments
Sep. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
derivativeInstruments
Apr. 06, 2020
Loss per share          
Number of derivative instruments held | derivativeInstruments   0   0  
Number of common stock shares issued per CSR (in shares)         1.2082
Effective exchange ratio of Foamix ordinary shares into Menlo common stock (share/share)         1.8006
Foamix          
Loss per share          
Proceeds from royalties $ 4.0 $ 6.0 $ 10.0    
Additional royalty upon receipt of marketing approval in China       $ 1.0