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Share-based Compensation - Awarded and Granted (Details) - shares
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Equity Incentive Plan    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]    
Awards outstanding beginning balance (in shares) 180,000 0
Awards granted (in shares) 132,400 180,000
Awards outstanding ending balance (in shares) 312,400 180,000
Awards exercisable (in shares) 60,000 0
MoonLake AG Restricted Founder Shares    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Awards outstanding, beginning balance (in shares) 1,110,078 4,440,309
Awards vested (in shares) (1,110,078) (3,330,231)
Awards outstanding, ending balance (in shares) 0 1,110,078
ESPP    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Awards outstanding, beginning balance (in shares) 2,237,915 1,060,561
Awards granted (in shares) 0 1,177,354
Awards vested (in shares) (1,607,425) (307,794)
Awards outstanding, ending balance (in shares) 2,237,915 2,237,915
ESOP | Employee Stock Option Plan (ESOP)    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]    
Awards outstanding beginning balance (in shares) 466,769 224,033
Awards granted (in shares) 133,446 242,736
Awards forfeited (in shares) (15,137)  
Awards outstanding ending balance (in shares) 585,078 466,769
Awards exercisable (in shares) 219,223