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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

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