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Geographic, Customer and Supplier Information - Sales Details of Customers Locations in Four Geographic Regions (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Geographic And Business Segment Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 62,426 us-gaap_SalesRevenueNet | $ 52,633 us-gaap_SalesRevenueNet | $ 47,654 us-gaap_SalesRevenueNet | $ 38,823 us-gaap_SalesRevenueNet | $ 43,265 us-gaap_SalesRevenueNet | $ 39,156 us-gaap_SalesRevenueNet | $ 37,260 us-gaap_SalesRevenueNet | $ 35,365 us-gaap_SalesRevenueNet | $ 201,537 us-gaap_SalesRevenueNet | $ 155,047 us-gaap_SalesRevenueNet | $ 154,029 us-gaap_SalesRevenueNet
Gross profit | 35,354 us-gaap_GrossProfit | 35,595 us-gaap_GrossProfit | 31,021 us-gaap_GrossProfit | 25,796 us-gaap_GrossProfit | 27,846 us-gaap_GrossProfit | 25,054 us-gaap_GrossProfit | 23,882 us-gaap_GrossProfit | 23,087 us-gaap_GrossProfit | 127,766 us-gaap_GrossProfit | 99,871 us-gaap_GrossProfit | 99,565 us-gaap_GrossProfit
Long-lived assets | 38,220 us-gaap_NoncurrentAssets |  |  |  | 43,898 us-gaap_NoncurrentAssets |  |  |  | 38,220 us-gaap_NoncurrentAssets | 43,898 us-gaap_NoncurrentAssets | 24,506 us-gaap_NoncurrentAssets
Europe, Middle East, Africa (EMEA) [Member] |  |  |  |  |  |  |  |  |  |  |
Geographic And Business Segment Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 129,385 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember | 95,794 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember | 94,992 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember
Gross profit |  |  |  |  |  |  |  |  | 80,267 us-gaap_GrossProfit / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember | 62,529 us-gaap_GrossProfit / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember | 61,367 us-gaap_GrossProfit / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember
Long-lived assets | 35,086 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember |  |  |  | 40,198 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember |  |  |  | 35,086 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember | 40,198 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember | 21,857 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Geographic And Business Segment Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 12,098 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 11,781 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 11,143 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
Gross profit |  |  |  |  |  |  |  |  | 10,143 us-gaap_GrossProfit / us-gaap_StatementGeographicalAxis = country_US | 9,477 us-gaap_GrossProfit / us-gaap_StatementGeographicalAxis = country_US | 8,842 us-gaap_GrossProfit / us-gaap_StatementGeographicalAxis = country_US
Long-lived assets | 3,031 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US |  |  |  | 3,496 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US |  |  |  | 3,031 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US | 3,496 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US | 2,470 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US
Asia Pacific [Member] |  |  |  |  |  |  |  |  |  |  |
Geographic And Business Segment Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 42,365 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember | 27,356 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember | 32,783 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember
Gross profit |  |  |  |  |  |  |  |  | 23,996 us-gaap_GrossProfit / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember | 14,552 us-gaap_GrossProfit / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember | 17,178 us-gaap_GrossProfit / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember
Long-lived assets | 31 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember |  |  |  | 43 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember |  |  |  | 31 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember | 43 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember | 16 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember
Other Countries [Member] |  |  |  |  |  |  |  |  |  |  |
Geographic And Business Segment Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 17,689 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = vdsi_OtherForeignCountriesMember | 20,116 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = vdsi_OtherForeignCountriesMember | 15,111 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = vdsi_OtherForeignCountriesMember
Gross profit |  |  |  |  |  |  |  |  | 13,360 us-gaap_GrossProfit / us-gaap_StatementGeographicalAxis = vdsi_OtherForeignCountriesMember | 13,313 us-gaap_GrossProfit / us-gaap_StatementGeographicalAxis = vdsi_OtherForeignCountriesMember | 12,178 us-gaap_GrossProfit / us-gaap_StatementGeographicalAxis = vdsi_OtherForeignCountriesMember
Long-lived assets | $ 72 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = vdsi_OtherForeignCountriesMember |  |  |  | $ 161 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = vdsi_OtherForeignCountriesMember |  |  |  | $ 72 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = vdsi_OtherForeignCountriesMember | $ 161 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = vdsi_OtherForeignCountriesMember | $ 163 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = vdsi_OtherForeignCountriesMember

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