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Share-Based Compensation - Narrative (Details) $ in Thousands |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Apr. 05, 2022 | Apr. 28, 2021 SFr / shares shares | Mar. 31, 2025 USD ($) co-founder plan shares | Mar. 31, 2024 USD ($) | Dec. 31, 2024 shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Number of share-based compensation plans | plan |  |  | 2 |  |
Share-based compensation expense | $ |  |  | $ 2,290 | $ 1,677 |
Number of co-founders | co-founder |  |  | 3 |  |
Share-based compensation arrangement by share-based payment award, options, exercises in period, intrinsic value | $ |  |  | $ 0 |  |
Equity Incentive Plan |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense | $ |  |  | $ 1,583 | 960 |
Common shares issuable (in shares) |  |  | 1,188,813 |  |
Weighted average period of recognition |  |  | 2 years 7 months 13 days |  |
Expiration period | 10 years |  |  |  |
Unrecognized compensation expense | $ |  |  | $ 23,900 |  |
ESPP |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense | $ |  |  | 725 | 717 |
Unrecognized share-based compensation expense, non-option awards | $ |  |  | $ 2,400 |  |
Weighted average period of recognition |  |  | 9 months 18 days |  |
ESPP | Share-Based Payment Arrangement, Tranche One |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  |  | 25.00% |  |
ESPP | Share-Based Payment Arrangement, Tranche Two |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  |  | 25.00% |  |
ESPP | Share-Based Payment Arrangement, Tranche Three |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  |  | 25.00% |  |
ESPP | Share-Based Payment Arrangement, Tranche Four |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  |  | 25.00% |  |
ESOP |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense | $ |  |  | $ (18) | $ 0 |
ESOP | Employee Stock Option Plan (ESOP) | Share-Based Payment Arrangement, Tranche One |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  |  | 25.00% |  |
ESOP | Employee Stock Option Plan (ESOP) | Share-Based Payment Arrangement, Tranche Two |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  |  | 25.00% |  |
ESOP | Employee Stock Option Plan (ESOP) | Share-Based Payment Arrangement, Tranche Three |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  |  | 25.00% |  |
ESOP | Employee Stock Option Plan (ESOP) | Share-Based Payment Arrangement, Tranche Four |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  |  | 25.00% |  |
Common Class A |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Common shares issuable (in shares) |  |  | 2,831,466 |  |
Share-based compensation arrangement by share-based payment award, number of shares authorized (in shares) |  |  | 4,353,948 |  |
Common shares, shares outstanding (in shares) |  |  | 63,474,253 |  | 63,077,431
Common Class C |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Common shares, shares outstanding (in shares) |  |  | 729,320 |  | 841,269
MoonLake AG |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Reverse vesting percentage |  | 90.00% |  |  |
Common shares, shares outstanding (in shares) |  | 110,000 |  |  |
MoonLake AG | MoonLake AG Restricted Founder Shares |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Common shares, shares outstanding (in shares) |  | 99,000 |  |  |
Vesting percentage |  | 4.166% |  |  |
Vesting period |  | 2 years |  |  |
Nominal value (CHF per share) | SFr / shares |  | SFr 0.10 |  |  |
MoonLake AG | Common Class C |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Common shares, shares outstanding (in shares) |  | 3,700,257 |  |  |
MoonLake AG | Common Class C | MoonLake AG Restricted Founder Shares |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Common shares, shares outstanding (in shares) |  | 3,330,231 |  |  |

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