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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2023
Feb. 16, 2024
Jun. 30, 2023
Cover [Abstract]      
Amendment Flag true    
Document Type 10-K/A    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000730272    
Current Fiscal Year End Date --12-31    
Document Period End Date Dec. 31, 2023    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Securities Act File Number 000-14656    
Entity Registrant Name REPLIGEN CORP    
Entity Filer Category Large Accelerated Filer    
Trading Symbol RGEN    
Title of 12(b) Security Common Stock    
Security Exchange Name NASDAQ    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 04-2729386    
Entity Address, Address Line One 41 Seyon Street, Bldg. 1, Suite 100    
Entity Address, City or Town Waltham    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 02453    
City Area Code 781    
Entity Shell Company false    
Smaller reporting company false    
Emerging growth company false    
Local Phone Number 250-0111    
Document Annual Report true    
Document Transition Report false    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer Yes    
Entity Public Float     $ 6,931,847,028
Entity Common Stock, Shares Outstanding   55,771,075  
ICFR Auditor Attestation Flag true    
Documents Incorporated by Reference

Documents Incorporated By Reference

Our Portions of the Proxy Statement for the 2023 Annual Meeting of Shareholders are incorporated by reference into Part III of this Report.

   
Auditor Firm Id 42    
Auditor Firm Name Ernst & Young LLP    
Auditor Firm Location Boston, Massachusetts, United States    
Document Financial Statement Error Correction [Flag] false    
Amendment Description Repligen Corporation (“we,” “us,” “our,” or the “Company”) is filing this Amendment No. 1 on Form 10-K/A (the “Amendment”) to amend and restate certain items in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023, originally filed with the U.S. Securities and Exchange Commission (the “SEC”) on February 22, 2024 (the “Original Report”), as listed in “Items Amended in this Filing” below. In filing this Amendment, we are restating our previously issued consolidated financial statements as of and for the twelve months ended December 31, 2023 to correct the misapplication of accounting principles under U.S. GAAP related to the timing of revenue recognition arising from a specific COVID-related cancellation payment, received in connection with a contract modification (collectively, the "Misstatement"), as further described in Note 1 to the consolidated financial statements herein. This restatement changes the timing of recognition of revenue, including the revenue reported in the Original Report, but will not change the total revenue to be recognized for this payment, nor have any impact on the Company’s previously reported cash and cash equivalent balances. This misapplication did not result from any override of controls, misconduct, or fraud of any kind. In connection with the restatement, the Company determined that it was appropriate to revise the consolidated balance sheet as of December 31, 2022 and the consolidated statements of cash flows for the periods ended December 31, 2022 and 2021, as well as impacted footnote disclosures, in this Form 10-K/A to correct other unrelated immaterial errors. In addition, we have filed amendments to the unaudited condensed consolidated quarterly financial information previously reported in our Quarterly Reports on Form 10-Q for quarterly periods ended March 30, 2023, originally filed with the SEC on May 2, 2023, June 30, 2023, originally filed with the SEC on August 2, 2023, and September 30, 2023, originally filed with the SEC on October 31, 2023. We are also filing amendments to the unaudited condensed consolidated quarterly financial information previously reported in our Quarterly Reports on Form 10-Q for the fiscal quarters ended March 31, 2024, originally filed with the SEC on May 1, 2024, and June 30, 2024, originally filed with the SEC on July 30, 2024 (collectively, the “Amended Quarterly Reports,” and together with this Amendment, the “Amended Reports”). In correcting the Misstatement in this Amendment, we have also restated other financial statement line item amounts including but not limited to product revenues, income tax provision, net income, foreign currency translation, deferred revenues, prepaid expenses, deferred taxes and earnings-per-share.