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Intangible Assets - Schedule of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Indefinite-lived Intangible Assets [Line Items] |  |  |
Beginning Balance | $ 16,733 us-gaap_IntangibleAssetsNetExcludingGoodwill | $ 6,507 us-gaap_IntangibleAssetsNetExcludingGoodwill |
Net foreign currency translation | (80)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAdjustments | 67 us-gaap_IndefiniteLivedIntangibleAssetsTranslationAdjustments |
Amortization expense | (4,532)us-gaap_AmortizationOfIntangibleAssets | (3,325)us-gaap_AmortizationOfIntangibleAssets | (1,905)us-gaap_AmortizationOfIntangibleAssets
Ending Balance | 12,819 us-gaap_IntangibleAssetsNetExcludingGoodwill | 16,733 us-gaap_IntangibleAssetsNetExcludingGoodwill | 6,507 us-gaap_IntangibleAssetsNetExcludingGoodwill
End of year, balance at cost | 32,518 us-gaap_FiniteLivedIntangibleAssetsGross |  |
Accumulated amortization | (19,699)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  |
Ending Balance | 12,819 us-gaap_IntangibleAssetsNetExcludingGoodwill | 16,733 us-gaap_IntangibleAssetsNetExcludingGoodwill | 6,507 us-gaap_IntangibleAssetsNetExcludingGoodwill
Cronto [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Additions |  | 13,257 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_BusinessAcquisitionAxis = vdsi_CrontoMember |
Other Acquisitions [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Additions | 698 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_BusinessAcquisitionAxis = vdsi_OtherAcquisitionsMember | 227 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_BusinessAcquisitionAxis = vdsi_OtherAcquisitionsMember |
Capitalized Technology [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Beginning Balance | 13,776 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | 4,847 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |
Net foreign currency translation | (38)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | 6 us-gaap_IndefiniteLivedIntangibleAssetsTranslationAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |
Amortization expense | (4,053)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | (3,014)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |
Ending Balance | 10,216 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | 13,776 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |
End of year, balance at cost | 28,947 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |  |
Accumulated amortization | (18,731)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |  |
Ending Balance | 10,216 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | 13,776 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |
Capitalized Technology [Member] | Cronto [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Additions |  | 11,937 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_BusinessAcquisitionAxis = vdsi_CrontoMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |
Capitalized Technology [Member] | Other Acquisitions [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Additions | 531 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_BusinessAcquisitionAxis = vdsi_OtherAcquisitionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | 0 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_BusinessAcquisitionAxis = vdsi_OtherAcquisitionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |
Patents and Trademarks [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Beginning Balance | 1,961 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = vdsi_PatentsAndTrademarksMember | 1,642 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = vdsi_PatentsAndTrademarksMember |
Net foreign currency translation | (1)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = vdsi_PatentsAndTrademarksMember | 0 us-gaap_IndefiniteLivedIntangibleAssetsTranslationAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = vdsi_PatentsAndTrademarksMember |
Amortization expense | (198)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = vdsi_PatentsAndTrademarksMember | (143)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = vdsi_PatentsAndTrademarksMember |
Ending Balance | 1,929 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = vdsi_PatentsAndTrademarksMember | 1,961 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = vdsi_PatentsAndTrademarksMember |
End of year, balance at cost | 2,435 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = vdsi_PatentsAndTrademarksMember |  |
Accumulated amortization | (506)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = vdsi_PatentsAndTrademarksMember |  |
Ending Balance | 1,929 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = vdsi_PatentsAndTrademarksMember | 1,961 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = vdsi_PatentsAndTrademarksMember |
Patents and Trademarks [Member] | Cronto [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Additions |  | 235 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_BusinessAcquisitionAxis = vdsi_CrontoMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = vdsi_PatentsAndTrademarksMember |
Patents and Trademarks [Member] | Other Acquisitions [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Additions | 167 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_BusinessAcquisitionAxis = vdsi_OtherAcquisitionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = vdsi_PatentsAndTrademarksMember | 227 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_BusinessAcquisitionAxis = vdsi_OtherAcquisitionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = vdsi_PatentsAndTrademarksMember |
Other [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Beginning Balance | 996 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | 18 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |
Net foreign currency translation | (41)us-gaap_IndefiniteLivedIntangibleAssetsTranslationAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | 61 us-gaap_IndefiniteLivedIntangibleAssetsTranslationAdjustments / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |
Amortization expense | (281)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | (168)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |
Ending Balance | 674 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | 996 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |
End of year, balance at cost | 1,136 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  |
Accumulated amortization | (462)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  |
Ending Balance | 674 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | 996 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |
Other [Member] | Cronto [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Additions |  | 1,085 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_BusinessAcquisitionAxis = vdsi_CrontoMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |
Other [Member] | Other Acquisitions [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Additions | $ 0 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_BusinessAcquisitionAxis = vdsi_OtherAcquisitionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember | $ 0 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_BusinessAcquisitionAxis = vdsi_OtherAcquisitionsMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |

X
- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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X
- Definition Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, resulting from a business combination. + References No definition available. + Details
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- Definition Amount of increase (decrease) of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit, from foreign currency translation adjustments. + References No definition available. + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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