Cover Page - shares	3 Months Ended
	Mar. 31, 2024	Apr. 26, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
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 $0.001 per share
Trading Symbol	OSPN
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		37,845,509
Entity Central Index Key	0001044777
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Amendment Flag	false