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Document and Entity Information - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Mar. 03, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2024    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Trading Symbol FORR    
Entity Registrant Name Forrester Research, Inc.    
Entity Central Index Key 0001023313    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   18,981,000  
Entity Public Float     $ 197,000,000
Document Annual Report true    
Document Transition Report false    
Entity Incorporation, State or Country Code DE    
Entity File Number 000-21433    
Entity Tax Identification Number 04-2797789    
Entity Address, Address Line One 60 Acorn Park Drive    
Entity Address, City or Town Cambridge    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 02140    
City Area Code 617    
Local Phone Number 613-6000    
Title of 12(b) Security Common Stock, $0.01 Par Value    
Security Exchange Name NASDAQ    
Entity Interactive Data Current Yes    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction Flag false    
Auditor Name PricewaterhouseCoopers LLP    
Auditor Location Boston, Massachusetts    
Auditor Firm ID 238    
Auditor Opinion

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated balance sheets of Forrester Research, Inc. and its subsidiaries (the "Company") as of December 31, 2024 and 2023, and the related consolidated statements of operations, of comprehensive income (loss), of stockholders’ equity and of cash flows for each of the three years in the period ended December 31, 2024, including the related notes (collectively referred to as the "consolidated financial statements"). We also have audited the Company's internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2024 in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control - Integrated Framework (2013) issued by the COSO.