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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2022
Feb. 25, 2023
Jun. 30, 2022
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2022    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 000-24389    
Entity Registrant Name OneSpan Inc.    
Entity Tax Identification Number 36-4169320    
Entity Address, Address Line One 121 West Wacker Drive, Suite 2050    
Entity Address, City or Town Chicago    
Entity Address, State or Province IL    
Entity Address, Postal Zip Code 60601    
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    
Entity Shell Company false    
Entity Public Float     $ 471,211,321
Entity Common Stock, Shares Outstanding   40,001,325  
Entity Central Index Key 0001044777    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Incorporation, State or Country Code DE