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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2023
Mar. 01, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 000-24389    
Entity Registrant Name OneSpan Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 36-4169320    
Entity Address, Address Line One 1 Marina Park Drive    
Entity Address, Address Line Two Unit 1410    
Entity Address, City or Town Boston    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 02210    
City Area Code 312    
Local Phone Number 766-4001    
Title of 12(b) Security Common Stock, par value $.001 per share    
Trading Symbol OSPN    
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 Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 588,629,980
Entity Common Stock, Shares Outstanding   37,789,737  
Documents Incorporated by Reference
Certain sections of the registrant’s Notice of Annual Meeting of Stockholders and Proxy Statement for its 2024 Annual Meeting of Stockholders are incorporated by reference into Part III of this report.
    
Entity Central Index Key 0001044777    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false