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BUSINESS COMBINATION - Narrative (Details)
3 Months Ended 9 Months Ended
Apr. 06, 2020
USD ($)
$ / shares
shares
Mar. 09, 2020
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
May 11, 2020
USD ($)
Business Acquisition [Line Items]              
Number of common stock shares issued per CSR (in shares) 1.2082            
Effective exchange ratio (CSR per share) 1.8006            
Share issued and delivered upon CSR conversion (in shares) | shares 74,544,413            
Ownership percentage of parent by subsidiary stockholders 82.00%            
Ownership percentage of parent by parent stockholders 18.00%            
Closing share price (in usd per share) | $ / shares $ 1.40            
Goodwill impairment loss     $ 0   $ 4,000,000.0    
Value of CSR converted into additional shares of the combined company   $ 19,600,000          
Contingent Stock Right Remeasurement $ 84,700,000   0 $ 0 84,726,000 $ 0  
Contingent consideration, fair value of liability $ 104,400,000            
In Process Research and Development              
Business Acquisition [Line Items]              
In process research and development impairment     $ 0   50,300,000    
Foamix              
Business Acquisition [Line Items]              
Number of contingent stock rights issued (in CSR)   1          
Transaction costs             $ 21,800,000
Closing share price (in usd per share) | $ / shares   $ 2.99          
Consideration transferred   $ 131,079,000          
Deemed (for accounting purposes only) issuance of Foamix shares to Menlo stockholders   $ 123,757,000          
Number of shares deemed (for accounting purposes only) issued (in shares) | shares   41,400,000          
Deemed (for accounting purposes only) conversion of Menlo equity awards   $ 7,322,000          
Value of CSR converted into additional shares of the combined company   19,600,000          
Contingent consideration, fair value of liability   $ 19,600,000          
Foamix | Employee benefits              
Business Acquisition [Line Items]              
Acquisition related costs         8,100,000    
Foamix | Selling, general and administrative              
Business Acquisition [Line Items]              
Acquisition related costs         $ 11,700,000    
Common stock | Foamix              
Business Acquisition [Line Items]              
Exchange ratio per ordinary share for common stock (share per share)   0.5924