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BUSINESS COMBINATION - Narrative (Details) |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 12, 2021 shares | Apr. 07, 2020 | Apr. 06, 2020 USD ($) $ / shares shares | Mar. 09, 2020 USD ($) contingentStockRight $ / shares shares | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Number of common stock issued per CSR (in shares) |  |  | 1.2082 |  |  |
Effective exchange ratio of Foamix ordinary shares into Menlo common stock |  |  | 1.8006 |  |  |
Share issued and delivered upon CSR conversion (in shares) | shares | 18,636,103 |  | 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 dollars per share) | $ / shares |  |  | $ 1.40 |  |  |
Consideration transferred |  |  |  |  | $ 131,079,000 |
Deemed (for accounting purposes only) issuance of Foamix shares to Menlo stockholders |  |  |  |  | 123,757,000 |
Deemed (for accounting purposes only) conversion of Menlo equity awards |  |  |  |  | 7,322,000 |
Goodwill impairment loss |  |  |  |  | 0 | $ 4,500,000
Goodwill and in-process research & development impairments |  |  |  |  | 0 | 54,345,000
Value of CSR converted into additional shares of the combined company |  |  |  | $ 19,600,000 |  |
Contingent stock right remeasurement |  |  | $ 84,700,000 |  | 0 | 84,726,000
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 | 49,800,000
Foamix |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of contingent stock rights issued (in CSR) | contingentStockRight |  |  |  | 1 |  |
Closing share price (in dollars per share) | $ / shares |  |  |  | $ 2.99 |  |
Consideration transferred |  |  |  | $ 131,100,000 |  |
Deemed (for accounting purposes only) issuance of Foamix shares to Menlo stockholders |  |  |  | $ 123,800,000 |  |
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 |  |  |  | $ 7,300,000 |  |
Goodwill deductible for income tax purposes |  |  |  | $ 0 |  |
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 |  |
Number of contingent stock rights issued (in CSR) | contingentStockRight |  |  |  | 1 |  |

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