| Cover | Jun. 28, 2021 |
| Cover [Abstract] | |
| Entity Registrant Name | Celcuity Inc. |
| Entity Central Index Key | 0001603454 |
| Document Type | 8-K |
| Amendment Flag | false |
| Entity Emerging Growth Company | true |
| Document Period End Date | Jun. 28, 2021 |
| Entity Ex Transition Period | true |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-38207 |
| Entity Tax Identification Number | 82-2863566 |
| Entity Address Address Line 1 | 16305 36th Avenue North |
| Entity Address Address Line 2 | Suite 100 |
| Entity Address City Or Town | Minneapolis |
| Entity Address State Or Province | MN |
| Entity Address Postal Zip Code | 55446 |
| City Area Code | 763 |
| Local Phone Number | 392-0767 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.001 par value per share |
| Trading Symbol | CELC |
| Security Exchange Name | NASDAQ |
