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Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
 9 Months Ended 61 Months Ended
Sep. 30, 2015
Jun. 25, 2015
Loss Contingencies [Line Items]    
Revenues from all sales to distributor   $ 3.1
Putative Class Action Complaint [Member]    
Loss Contingencies [Line Items]    
Loss contingency, Lawsuit filing date July 28, 2015  
Loss contingency, Name of defendants VASCO and certain of its current executive officers  
Derivative Complaint [Member]    
Loss Contingencies [Line Items]    
Loss contingency, Lawsuit filing date October 9, 2015  
Loss contingency, Name of defendants VASCO's Board of Directors and certain of its executive officers