| Cover | Oct. 01, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Oct. 1, 2021 |
| Entity File Number | 001-39799 |
| Entity Registrant Name | Certara, Inc. |
| Entity Central Index Key | 0001827090 |
| Entity Tax Identification Number | 82-2180925 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 100 Overlook Center |
| Entity Address, Address Line Two | Suite 101 |
| Entity Address, City or Town | Princeton |
| Entity Address, State or Province | NJ |
| Entity Address, Postal Zip Code | 08540 |
| City Area Code | 609 |
| Local Phone Number | 716-7900 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock, par value $0.01 per share |
| Trading Symbol | CERT |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
