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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($)
Total
Common Class A
Common Class C
Total Shareholders' Equity
Common Stock
Common Class A
Common Stock
Common Class C
Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Income
Noncontrolling Interests
Common stock, beginning balance (in shares) at Dec. 31, 2023         60,466,453 2,505,476        
Equity, beginning balance at Dec. 31, 2023 $ 513,491,000     $ 495,676,000 $ 6,000 $ 0 $ 609,969,000 $ (116,657,000) $ 2,358,000 $ 17,815,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Share-based compensation under the ESPP and Equity Incentive Plan 1,677,000     1,693,000     1,693,000     (16,000)
Conversion of MoonLake Class C Ordinary Shares into Class A Ordinary Shares (in shares)         1,493,356 (1,493,356)        
Conversion of MoonLake Class C Ordinary Shares into Class A Ordinary Shares 0     10,613,000     10,537,000   76,000 (10,613,000)
Buyback of unvested MoonLake AG Common Shares by MoonLake AG into treasury following an employee contract termination (Note 12) 0     114,000     113,000   1,000 (114,000)
Capital injection from MoonLake to MoonLake AG (Note 12) (1,610,000)     (4,667,000)     (4,667,000)     3,057,000
Cancellation of Class C shares following an employee contract termination in MoonLake AG (in shares)           (16,853)        
Cancellation of MoonLake Class C Ordinary Shares following an employee contract termination in MoonLake AG (Note 12) 0                  
Issuance of Class A Ordinary Shares, net of transaction costs (in shares)         914,828          
Issuance of Class A Ordinary Shares, net of transaction costs (Note 12) 52,540,000     52,540,000     52,540,000      
Other comprehensive income (loss) 263,000     257,000         257,000 6,000
Net loss (13,975,000)     (13,673,000)       (13,673,000)   (302,000)
Common stock, ending balance (in shares) at Mar. 31, 2024         62,874,637 995,267        
Equity, end balance at Mar. 31, 2024 552,386,000     542,553,000 $ 6,000 $ 0 670,185,000 (130,330,000) 2,692,000 9,833,000
Common stock, beginning balance (in shares) at Dec. 31, 2024   63,077,431 841,269   63,077,431 841,269        
Equity, beginning balance at Dec. 31, 2024 453,391,000     446,825,000 $ 6,000 $ 0 677,415,000 (235,593,000) 4,997,000 6,566,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]                    
Share-based compensation under the ESPP and Equity Incentive Plan 2,290,000     2,279,000     2,279,000     11,000
Conversion of MoonLake Class C Ordinary Shares into Class A Ordinary Shares (in shares)         111,949 (111,949)        
Conversion of MoonLake Class C Ordinary Shares into Class A Ordinary Shares $ 0     851,000     841,000   10,000 (851,000)
Stock options exercised (in shares) 93,347       93,347          
Options exercised and converted under the Employee Stock Option Plan, net of stamp duty fee $ 120,000     129,000     129,000     (9,000)
Issuance of Restricted Stock Awards under the Equity Incentive Plan (in shares) 191,526       191,526          
Other comprehensive income (loss) $ (2,661,000)     (2,620,000)         (2,620,000) (41,000)
Net loss (40,559,000)     (39,944,000)       (39,944,000)   (615,000)
Common stock, ending balance (in shares) at Mar. 31, 2025   63,474,253 729,320   63,474,253 729,320        
Equity, end balance at Mar. 31, 2025 $ 412,581,000     $ 407,520,000 $ 6,000 $ 0 $ 680,664,000 $ (275,537,000) $ 2,387,000 $ 5,061,000