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Shareholders’ Equity - Narrative (Details) |  |  |  |  |  | 3 Months Ended |  |  |  |  |
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Mar. 08, 2024 USD ($) shares | Jul. 10, 2023 USD ($) | Jul. 09, 2023 USD ($) shares | Jun. 30, 2023 USD ($) | Jun. 27, 2023 USD ($) $ / shares shares | Mar. 31, 2025 USD ($) vote $ / shares shares | Mar. 31, 2024 shares | Dec. 31, 2024 $ / shares shares | Dec. 31, 2023 shares | Aug. 31, 2023 USD ($) | May 11, 2023 USD ($) | Apr. 28, 2021 shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, conversion ratio (in shares) |  |  |  |  |  | 33.638698 |  |  |  |  |  |
Sale of stock, stamp duty tax | $ |  | $ (2,800,000) |  |  |  |  |  |  |  |  |  |
Stock options exercised (in shares) |  |  |  |  |  | 93,347 |  |  |  |  |  |
May 2023 Sales Agreement | ATM Shares |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, authorized amount (in shares) | $ |  |  |  |  |  |  |  |  |  |  | $ 200,000,000.0 |
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) | $ |  |  |  |  |  |  |  |  |  | $ 350,000,000.0 |  |
August 2023 Sales Agreement | ATM Shares |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, authorized amount (in shares) | $ |  |  |  |  |  | $ 265,000,000.0 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
Sale of stock, stamp duty tax | $ | $ (1,600,000) |  |  |  |  |  |  |  |  |  |  |
Underwriting Agreement |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock (in shares) |  |  |  |  | 8,000,000 |  |  |  |  |  |  |
Net proceeds from the business combination | $ |  |  |  | $ 436,700,000 |  |  |  |  |  |  |  |
Issuance price per share (USD per share) | $ / shares |  |  |  |  | $ 50.00 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Sales Agreements |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from the business combination | $ |  |  |  |  |  | $ 0 |  |  |  |  |  |
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) |  |  |  |  |  | 63,474,253 |  | 63,077,431 |  |  |  |
Common shares, shares outstanding (in shares) |  |  |  |  |  | 63,474,253 |  | 63,077,431 |  |  |  |
Common shares, shares authorized (in shares) |  |  |  |  |  | 500,000,000 |  | 500,000,000 |  |  |  |
Common shares, par value (USD per share) | $ / shares |  |  |  |  |  | $ 0.0001 |  | $ 0.0001 |  |  |  |
Common Class A | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common shares, shares issued (in shares) |  |  |  |  |  | 63,474,253 |  | 63,077,431 |  |  |  |
Common shares, shares outstanding (in shares) |  |  |  |  |  | 63,474,253 | 62,874,637 | 63,077,431 | 60,466,453 |  |  |
Common shares, shares authorized (in shares) |  |  |  |  |  | 500,000,000 |  | 500,000,000 |  |  |  |
Common shares, par value (USD per share) | $ / shares |  |  |  |  |  | $ 0.0001 |  |  |  |  |  |
Common shares, votes per share | vote |  |  |  |  |  | 1 |  |  |  |  |  |
Conversion of MoonLake Class C Ordinary Shares into Class A Ordinary Shares (in shares) |  |  |  |  |  | 111,949 | 1,493,356 |  |  |  |  |
Stock options exercised (in shares) |  |  |  |  |  | 93,347 |  |  |  |  |  |
Common Class A | Common Stock | Conversion Of Class C into Class A |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion of MoonLake Class C Ordinary Shares into Class A Ordinary Shares (in shares) |  |  |  |  |  | 111,949 |  |  |  |  |  |
Common Class A | Common Stock | A&R Shareholders Agreement |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion of MoonLake Class C Ordinary Shares into Class A Ordinary Shares (in shares) |  |  |  |  |  | 111,949 |  |  |  |  |  |
Common Class C |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common shares, shares issued (in shares) |  |  |  |  |  | 729,320 |  | 841,269 |  |  |  |
Common shares, shares outstanding (in shares) |  |  |  |  |  | 729,320 |  | 841,269 |  |  |  |
Common shares, shares authorized (in shares) |  |  |  |  |  | 100,000,000 |  | 100,000,000 |  |  |  |
Common shares, par value (USD per share) | $ / shares |  |  |  |  |  | $ 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) |  |  |  |  |  | 729,320 |  | 841,269 |  |  |  |
Common shares, shares outstanding (in shares) |  |  |  |  |  | 729,320 | 995,267 | 841,269 | 2,505,476 |  |  |
Common shares, shares authorized (in shares) |  |  |  |  |  | 100,000,000 |  | 100,000,000 |  |  |  |
Common shares, par value (USD per share) | $ / shares |  |  |  |  |  | $ 0.0001 |  |  |  |  |  |
Common shares, votes per share | vote |  |  |  |  |  | 1 |  |  |  |  |  |
Conversion of MoonLake Class C Ordinary Shares into Class A Ordinary Shares (in shares) |  |  |  |  |  | (111,949) | (1,493,356) |  |  |  |  |
Common Class C | Common Stock | Conversion Of Class C into Class A |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion of MoonLake Class C Ordinary Shares into Class A Ordinary Shares (in shares) |  |  |  |  |  | (111,949) |  |  |  |  |  |
Common Class C | Common Stock | A&R Shareholders Agreement |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion of MoonLake Class C Ordinary Shares into Class A Ordinary Shares (in shares) |  |  |  |  |  | 111,949 |  |  |  |  |  |
Common Class C | Common Stock | MoonLake AG |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock, shares, acquired (in shares) | 16,853 |  |  |  |  |  |  |  |  |  |  |
MoonLake AG | Common Stock | A&R Shareholders Agreement |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion of MoonLake Class C Ordinary Shares into Class A Ordinary Shares (in shares) |  |  |  |  |  | 3,328 |  |  |  |  |  |

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