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Geographic, Customer and Supplier Information - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015 Country Customer Vendor	Dec. 31, 2014	Dec. 31, 2013
Revenue, Major Customer [Line Items]
Geographic regions | Country	4
Number of independent vendors | Vendor	4
Top ten customers contribution of total worldwide revenue	50.00%	46.00%	40.00%
Number of customers contributed | Customer	10
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer One [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue contributed by customer	30.00%	12.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer Two [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue contributed by customer		11.00%	18.00%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611

+ Details

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Balance Type:	na
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Entity wide percentage of revenue by major customer percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	vdsi_
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Balance Type:	na
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- Definition

Number of geographical location.

+ References

No definition available.

+ Details

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- Definition

Number of top revenue contributors.

+ References

No definition available.

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X

- Definition

Number of vendors.

+ References

No definition available.

+ Details

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- Details

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- Details

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