| Document and Entity Information | May 15, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | May 15, 2023 |
| Entity Registrant Name | CalciMedica, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-39538 |
| Entity Tax Identification Number | 45-2120079 |
| Entity Address, Address Line One | 505 Coast Boulevard South |
| Entity Address, Address Line Two | 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 |
| Title of 12(b) Security | Common Stock, $0.0001 par value per share |
| Trading Symbol | CALC |
| Security Exchange Name | NONE |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | true |
| Amendment Flag | false |
| Entity Central Index Key | 0001534133 |
