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v2.4.1.9

Deferred Warranty Revenue and Warranty Reserve - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2014
Minimum [Member] |
Guarantor Obligations [Line Items] |
Warranty for hardware purchase | 1 year
Extended product warranty period | 1 year
Maximum [Member] |
Guarantor Obligations [Line Items] |
Warranty for hardware purchase | 2 years
Extended product warranty period | 4 years

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- Details
Name: | us-gaap_GuaranteeObligationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Extended Warranty Period Related To Hardware Products + References No definition available. + Details
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Namespace Prefix: | vdsi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Standard product warranty period. + References No definition available. + Details
Name: | vdsi_StandardProductWarrantyPeriod
Namespace Prefix: | vdsi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |