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Shareholders’ Equity (Deficit) - Narrative (Details)
 1 Months Ended 12 Months Ended
Jul. 10, 2023
USD ($)
shares
Jun. 30, 2023
USD ($)
Jun. 27, 2023
USD ($)
$ / shares
shares
Oct. 04, 2021
shares
Dec. 31, 2023
USD ($)
vote
$ / shares
shares
May 31, 2023
USD ($)
shares
Dec. 31, 2023
vote
$ / shares
shares
Dec. 31, 2022
$ / shares
shares
Aug. 31, 2023
USD ($)
May 11, 2023
USD ($)
Apr. 05, 2022
shares
Dec. 31, 2021
shares
Apr. 28, 2021
$ / shares
shares
Class of Stock [Line Items]                          
Common shares, shares outstanding (in shares)                     52,701,111    
Sale of stock (in shares)         525,924 544,894              
Sale of stock, consideration received on transaction | $         $ 31,700,000 $ 15,200,000              
Stamp duty tax | $ $ (2,800,000)                        
MoonLake AG                          
Class of Stock [Line Items]                          
Common shares, shares outstanding (in shares)                         110,000
MoonLake Immunotherapeutics | MoonLake AG                          
Class of Stock [Line Items]                          
Sale of stock, consideration received on transaction | $ 38,900,000                        
Proceeds from contributions from parent | $ $ 275,000,000                        
Underwriting Agreement                          
Class of Stock [Line Items]                          
Sale of stock (in shares)     8,000,000                    
Sale of stock, consideration received on transaction | $   $ 436,700,000                      
Payments of stock issuance costs | $   $ 23,300,000                      
Issuance price per share (USD per share) | $ / shares     $ 50.00                    
Underwriting Agreement | MoonLake Immunotherapeutics | MoonLake AG                          
Class of Stock [Line Items]                          
Sale of stock (in shares) 22,756                        
Over-Allotment Option                          
Class of Stock [Line Items]                          
Sale of stock (in shares)     1,200,000                    
Sale of stock, option to purchase, term     30 days                    
ATM Shares | May 2023 Sales Agreement                          
Class of Stock [Line Items]                          
Sale of stock, authorized amount | $                   $ 200,000,000      
Sale of stock, remaining authorized repurchase amount | $     $ 0                    
ATM Shares | August 2023 Sales Agreement                          
Class of Stock [Line Items]                          
Sale of stock, authorized amount | $                 $ 350,000,000        
Common Stock                          
Class of Stock [Line Items]                          
Common shares, shares outstanding (in shares)                       12,161,331  
Conversion and transfer of shares between classes (in shares)             333,486 61,000          
Common Class A                          
Class of Stock [Line Items]                          
Common shares, shares issued (in shares)         60,466,453   60,466,453 38,977,600          
Common shares, shares outstanding (in shares)         60,466,453   60,466,453 38,977,600          
Common shares, shares authorized (in shares)         500,000,000   500,000,000 500,000,000          
Common shares, par value (USD per share) | $ / shares         $ 0.0001   $ 0.0001 $ 0.0001         $ 0.0001
Sale of stock (in shares)       11,700,000     10,270,818            
Common Class A | Common Stock                          
Class of Stock [Line Items]                          
Common shares, shares issued (in shares)         60,466,453   60,466,453 38,977,600          
Common shares, shares outstanding (in shares)         60,466,453   60,466,453 38,977,600          
Common shares, shares authorized (in shares)         500,000,000   500,000,000 500,000,000          
Common shares, par value (USD per share) | $ / shares         $ 0.0001   $ 0.0001            
Common shares, votes per share | vote         1   1            
Conversion and transfer of shares between classes (in shares)             11,218,035 2,051,961          
Common Class C                          
Class of Stock [Line Items]                          
Common shares, shares issued (in shares)         2,505,476   2,505,476 13,723,511          
Common shares, shares outstanding (in shares)         2,505,476   2,505,476 13,723,511          
Common shares, shares authorized (in shares)         100,000,000   100,000,000 100,000,000          
Common shares, par value (USD per share) | $ / shares         $ 0.0001   $ 0.0001 $ 0.0001          
Common Class C | MoonLake AG                          
Class of Stock [Line Items]                          
Common shares, shares outstanding (in shares)                         3,700,257
Common Class C | Common Stock                          
Class of Stock [Line Items]                          
Common shares, shares issued (in shares)         2,505,476   2,505,476 13,723,511          
Common shares, shares outstanding (in shares)         2,505,476   2,505,476 13,723,511          
Common shares, shares authorized (in shares)         100,000,000   100,000,000 100,000,000          
Common shares, par value (USD per share) | $ / shares         $ 0.0001   $ 0.0001            
Common shares, votes per share | vote         1   1            
Conversion and transfer of shares between classes (in shares)             (11,218,035) 2,051,961