| Document and Entity Information | Oct. 30, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Oct. 30, 2024 |
| Entity Registrant Name | CalciMedica, Inc. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-39538 |
| Entity Tax Identification Number | 45-2120079 |
| Entity Address Address Line 1 | 505 Coast Boulevard South, Suite 307 |
| Entity Address City Or Town | La Jolla |
| Entity Address State Or Province | CA |
| Entity Address Postal Zip Code | 92037 |
| City Area Code | 858 |
| Local Phone Number | 952-5500 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.0001, par value per share |
| Trading Symbol | CALC |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity Central Index Key | 0001534133 |
| Amendment Flag | false |
