Business Combinations - Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Oct. 01, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets acquired and liabilities assumed:
Goodwill		$ 703,371	$ 518,592	$ 514,996
Pinnacle 21, LLC
Fair value of consideration:
Cash paid to sellers	$ 249,115
Cash paid to others and escrow	17,200
Unregistered shares of Certara, Inc. (2,239,717 shares)	72,760
Total consideration	$ 339,075
Unregistered shares of Certara, Inc., issued	2,239,717
Assets acquired and liabilities assumed:
Cash and cash equivalents	$ 19,409
Accounts receivable	2,925
Other current assets	619
Property and equipment	258
Deferred tax assets	2,907
Goodwill	180,947
Long-term deposits	34
Current liabilities	(794)
Current portion of deferred revenue	(10,630)
Net assets acquired	339,075
Pinnacle 21, LLC | Trademarks
Assets acquired and liabilities assumed:
Identifiable intangible assets	15,800
Pinnacle 21, LLC | Developed technology
Assets acquired and liabilities assumed:
Identifiable intangible assets	103,000
Pinnacle 21, LLC | Customer relationships
Assets acquired and liabilities assumed:
Identifiable intangible assets	$ 24,600