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Business Combination Agreement with Helix and Recapitalization - Ordinary Shares Issued (Details) - shares | Apr. 05, 2022 | Apr. 04, 2022 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |
Shares outstanding (in shares) | 52,701,111 |  |  |
Common Class A |  |  |  |
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |
Shares outstanding (in shares) |  |  | 60,466,453 | 38,977,600
Issuance of Class A Ordinary Shares, net of transaction costs (in shares) | 11,700,000 |  |  |
Plus issuance of helix class A ordinary shares to BVF shareholders (in shares) | 18,501,284 |  |  |
Total MoonLake class A ordinary Shares outstanding at closing (in shares) | 36,925,639 |  |  |
Common Class C |  |  |  |
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |
Shares outstanding (in shares) |  |  | 2,505,476 | 13,723,511
Plus issuance of helix class A ordinary shares to BVF shareholders (in shares) | 15,775,472 |  |  |
Issuance of Helix Class C ordinary shares to ML parties (other than the BVF shareholders) (in shares) | 15,775,472 |  |  |
Helix Acquisition Corp. |  |  |  |
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |
Shares outstanding (in shares) |  | 14,805,000 |  |
Helix Acquisition Corp. | Common Class A |  |  |  |
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |
Less redemptions of class A ordinary shares of the class A ordinary shares issued by Helix prior to the closing date (in shares) |  | (8,080,645) |  |
Helix Acquisition Corp. | Common class A, private placement |  |  |  |
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |
Shares outstanding (in shares) |  | 430,000 |  |
Helix Acquisition Corp. | Common class A, redeemable |  |  |  |
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |
Shares outstanding (in shares) |  | 11,500,000 |  |
Helix Acquisition Corp. | Class B Ordinary Shares |  |  |  |
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |
Shares outstanding (in shares) |  | 2,875,000 |  |

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