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Net Loss per Share - Narrative (Details) - $ / shares
 12 Months Ended
Apr. 05, 2022
Dec. 31, 2023
Dec. 31, 2022
Feb. 29, 2024
Dec. 31, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Weighted-average number of shares, basic (in shares)   49,122,534 29,361,353    
Weighted-average number of shares, diluted (in shares)   49,122,534 29,361,353    
Net loss per share - basic (in USD per share)   $ 0.73 $ 1.70    
Net loss per share - diluted (in USD per share)   $ 0.73 $ 1.70    
Number of shares outstanding (in shares) 52,701,111        
Pro forma          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Weighted-average number of shares, basic (in shares)   57,679,106      
Weighted-average number of shares, diluted (in shares)   57,679,106      
Net loss per share - basic (in USD per share)   $ 0.76      
Net loss per share - diluted (in USD per share)   $ 0.76      
Common Stock          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Number of shares outstanding (in shares)         12,161,331
ML parties other than BVF shareholders          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
MoonLake AG common shares (in shares)   74,482      
Common Class C          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Common shares, shares issued (in shares)   2,505,476 13,723,511    
Stock converted (in shares) 15,775,472        
Number of shares outstanding (in shares)   2,505,476 13,723,511    
Common Class C | Common Stock          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Common shares, shares issued (in shares)   2,505,476 13,723,511    
Number of shares outstanding (in shares)   2,505,476 13,723,511    
Common Class C | ML parties other than BVF shareholders | Pro forma          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Stock forfeited (in shares)   2,505,476      
Common Class A          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Common shares, shares issued (in shares)   60,466,453 38,977,600    
Weighted-average number of shares, basic (in shares)   49,122,534 29,361,353    
Weighted-average number of shares, diluted (in shares)   49,122,534 29,361,353    
Net loss per share - basic (in USD per share)   $ 0.73 $ 1.70    
Net loss per share - diluted (in USD per share)   $ 0.73 $ 1.70    
Number of shares outstanding (in shares)   60,466,453 38,977,600    
Common Class A | Pro forma | Subsequent Event          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Number of shares outstanding (in shares)       63,886,757  
Common Class A | Common Stock          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Common shares, shares issued (in shares)   60,466,453 38,977,600    
Number of shares outstanding (in shares)   60,466,453 38,977,600    
Common Class A | ML parties other than BVF shareholders | Pro forma          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Stock converted (in shares)   2,505,476