Shareholders’ Equity - Narrative (Details)						1 Months Ended	3 Months Ended						9 Months Ended
	Mar. 08, 2024 USD ($) shares	Jul. 10, 2023 USD ($)	Jul. 09, 2023 USD ($) shares	Jun. 30, 2023 USD ($) shares	Jun. 27, 2023 USD ($) $ / shares shares	Sep. 25, 2024 shares	Sep. 30, 2024 USD ($) vote $ / shares shares	Jun. 30, 2024 USD ($) shares	Mar. 31, 2024 USD ($) $ / shares shares	Sep. 30, 2023 shares	Jun. 30, 2023 shares	Mar. 31, 2023 shares	Sep. 30, 2024 vote $ / shares shares	Dec. 31, 2023 $ / shares shares	Aug. 31, 2023 USD ($)	May 11, 2023 USD ($)	Dec. 31, 2022 shares	Apr. 28, 2021 shares
Class of Stock [Line Items]
Sale of stock, stamp duty tax | $	$ 1,600,000	$ 2,800,000
Stock options exercised (in shares)							17,390
Common stock, conversion ratio (in shares)							33.638698						33.638698
May 2023 Sales Agreement | ATM Shares
Class of Stock [Line Items]
Sale of stock, authorized amount (in shares) | $																$ 200,000,000
Sale of stock, remaining authorized repurchase amount | $					$ 0
May 2023 And August 2023 Sales Agreement | ATM Shares
Class of Stock [Line Items]
Sale of stock, authorized amount (in shares) | $															$ 350,000,000
Equity Incentive Plan
Class of Stock [Line Items]
Stock options exercised (in shares)							17,390						17,390
MoonLake AG
Class of Stock [Line Items]
Common shares, shares outstanding (in shares)																		110,000
MoonLake AG | MoonLake Immunotherapeutics
Class of Stock [Line Items]
Net proceeds from the business combination | $	800,000		$ 38,900,000
Proceeds from contributions from parent | $	$ 150,000,000	$ 275,000,000
Underwriting Agreement
Class of Stock [Line Items]
Sale of stock (in shares)					8,000,000
Issuance price per share (USD per share) | $ / shares					$ 50.00
Net proceeds from the business combination | $				$ 436,700,000
Payments of stock issuance costs | $				$ 23,300,000
Underwriting Agreement | MoonLake AG | MoonLake Immunotherapeutics
Class of Stock [Line Items]
Sale of stock (in shares)	501		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
August 2023 Sales Agreement
Class of Stock [Line Items]
Sale of stock (in shares)									914,828
Issuance price per share (USD per share) | $ / shares									$ 58.31
Net proceeds from the business combination | $							$ 0	$ 0	$ 52,500,000
Common Stock | MoonLake AG
Class of Stock [Line Items]
Treasury stock, shares, acquired (in shares)	501
Common Class A
Class of Stock [Line Items]
Common shares, shares issued (in shares)							63,046,025						63,046,025	60,466,453
Common shares, shares outstanding (in shares)							63,046,025						63,046,025	60,466,453
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
Common Class A | Common Stock
Class of Stock [Line Items]
Common shares, shares issued (in shares)							63,046,025	62,874,637	62,874,637				63,046,025	60,466,453
Common shares, shares outstanding (in shares)				53,486,810			63,046,025	62,874,637	62,874,637	53,561,488	53,486,810	39,154,203	63,046,025	60,466,453			38,977,600
Common shares, shares authorized (in shares)							500,000,000	500,000,000	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)						153,998	153,998		1,493,356	74,678	4,587,713	176,603
Stock options exercised (in shares)							17,390
Common Class A | Common Stock | Conversion Of Class C into Class A
Class of Stock [Line Items]
Conversion and transfer of shares between classes (in shares)							153,998		1,493,356
Common Class C
Class of Stock [Line Items]
Common shares, shares issued (in shares)							841,269						841,269	2,505,476
Common shares, shares outstanding (in shares)							841,269						841,269	2,505,476
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)							841,269	995,267	995,267				841,269	2,505,476
Common shares, shares outstanding (in shares)				8,959,195			841,269	995,267	995,267	8,884,517	8,959,195	13,546,908	841,269	2,505,476			13,723,511
Common shares, shares authorized (in shares)							100,000,000	100,000,000	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)						153,998	(153,998)		(1,493,356)	(74,678)	(4,587,713)	(176,603)
Common Class C | Common Stock | Conversion Of Class C into Class A
Class of Stock [Line Items]
Conversion and transfer of shares between classes (in shares)							(153,998)		(1,493,356)
Common Class C | Common Stock | MoonLake AG
Class of Stock [Line Items]
Treasury stock, shares, acquired (in shares)	16,853
MoonLake AG | Common Stock
Class of Stock [Line Items]
Conversion and transfer of shares between classes (in shares)						4,578