Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2021	Feb. 25, 2022	Jun. 30, 2021
Document and Entity Information
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Document Transition Report	false
Entity File Number	001-39799
Entity Registrant Name	Certara, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	82-2180925
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
Title of 12(b) Security	Common stock, par value $0.01 per share
Trading Symbol	CERT
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
ICFR Auditor Attestation Flag	true
Entity Public Float			$ 2.1
Entity Common Stock, Shares Outstanding		159,657,724
Entity Central Index Key	0001827090
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Amendment Flag	false
Auditor Name	CohnReznick LLP
Auditor Firm ID	596
Auditor Location	Tysons, Virginia