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Contingencies - Pending Litigation (Details)			5 Months Ended	9 Months Ended
	Feb. 20, 2017 customer	Sep. 01, 2015	Mar. 22, 2016 complaint	Sep. 30, 2017
Pending Litigation
Contingencies
Number of new claims filed | complaint			2
Number of integrated reseller customers named in patent infringement lawsuit | customer	1
Pending Litigation | Linda J. Rossbach v. Vasco Data Security International, Inc., et al.
Contingencies
Loss contingency, Lawsuit filing date				July 28, 2015
Number of days allowed to file amended complaint		60 days
Loss contingency, Name of defendants				VASCO and certain of its current and former executive officers
Pending Litigation | Bunk v. Vasco Data Security International, Inc.
Contingencies
Loss contingency, Lawsuit filing date				January 30, 2017
Pending Litigation | William Hooper v. Hunt, et al.
Contingencies
Loss contingency, Lawsuit filing date				March 22, 2016
Pending Litigation | StrikeForce Technologies, Inc
Contingencies
Loss contingency, Lawsuit filing date				March 14, 2017
Judicial Ruling | Elizabeth Herrera v. Hunt, et al.
Contingencies
Loss contingency, Lawsuit filing date				October 9, 2015
Loss contingency, Name of defendants				VASCO's Board of Directors and certain of its current and former executive officers as individual defendants and the Company as a nominal defendant
Dismissal date				Jul. 12, 2017
Judicial Ruling | Beth Seltzer v. Hunt, et al.
Contingencies
Loss contingency, Lawsuit filing date				October 22, 2015
Dismissal date				Feb. 09, 2016

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Date the pending litigation matter was dismissed, in CCYY-MM-DD format.

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States the date the complaint was formally filed in a court of law, in arbitration or mediation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
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-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349

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Identifies the named defendant in a lawsuit.

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The total number of new claims filed pertaining to a loss contingency during the period.

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The number of integrated reseller customers named as defendant in patent infringement lawsuit.

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The number of days specified by scheduling order allowed for filing of amended complaint.

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