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Deferred Warranty Revenue and Warranty Reserve - Deferred Warranty Revenue (Detail) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($)
Guarantees [Abstract] |
2017 | $ 22
2018 | 12
2019 | 3
Total | $ 37

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- References No definition available. + Details
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X
- Definition The total amount of deferred revenue that will be recognized in future periods. + References No definition available. + Details
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Namespace Prefix: | vdsi_
Data Type: | xbrli:monetaryItemType
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- Definition Deferred revenue estimated revenue expected recognized fiscal year. + References No definition available. + Details
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Namespace Prefix: | vdsi_
Data Type: | xbrli:monetaryItemType
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- Definition Deferred revenue estimated revenue expected recognized year three. + References No definition available. + Details
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Namespace Prefix: | vdsi_
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- Definition Deferred revenue estimated revenue expected recognized year two. + References No definition available. + Details
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Namespace Prefix: | vdsi_
Data Type: | xbrli:monetaryItemType
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