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Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net income from continuing operations	$ 12,913	$ 4,152
Adjustments to reconcile net income from continuing operations to net cash provided by continuing operations:
Depreciation and amortization	2,863	1,876
Deferred tax expense (benefit)	(216)	225
Non-cash compensation	2,207	1,914
Changes in assets and liabilities:
Accounts receivable, net	(6,382)	12,581
Inventories	(6,097)	979
Foreign sales tax receivable	1,537	(799)
Other current assets	44	207
Accounts payable	(4,042)	295
Income taxes payable	572	(761)
Accrued expenses	3,416	1,737
Deferred revenue	1,406	(1,179)
Net cash provided by operating activities of continuing operations	8,221	21,227
Cash flows from investing activities of continuing operations:
Purchase of Alfa & Ariss	(1,301)	0
Additions to property and equipment	(742)	(1,001)
Additions to intangible assets	(7,241)	(157)
Other assets	(146)	(66)
Net cash used in investing activities of continuing operations	(9,430)	(1,224)
Cash flows from financing activities of continuing operations:
Proceeds from exercise of stock options and warrants	40	0
Net cash provided by financing activities of continuing operations	40	0
Cash flows used in discontinued operations:
Net cash used in operating activities of discontinued operations	(545)	0
Net cash used in investing activities of discontinued operations	(5,761)	0
Net cash used in discontinued operations	(6,306)	0
Effect of exchange rates on cash	(564)	(1,172)
Net increase (decrease) in cash	(8,039)	18,831
Cash and cash equivalents, beginning of year	85,533	67,601
Cash and cash equivalents, end of period	$ 77,494	$ 86,432

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The net cash from (used in) the entity's investing activities specifically EXCLUDING the cash flows derived by the entity from its discontinued operations, if any. This element is only to be used when the entity reports its cash flows attributable to discontinued operations separately from the cash flow provided by or used in investing activities. Such reporting would necessitate the entity to use the Net Cash provided by or used in Discontinued Operations, Total element provided in the taxonomy.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 26

-Footnote 10

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-Section 45

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- Definition

The net cash from (used in) the entity's continuing operations. This element specifically EXCLUDES the cash flows derived by the entity from its discontinued operations, if any. This element is only to be used when the entity reports its cash flows attributable to discontinued operations separately from the cash flow provided by or used in operating activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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X

- Definition

The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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X

- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

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- Definition

The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-Name Accounting Standards Codification

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



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-Name Accounting Standards Codification

-Topic 718

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+ Details

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Namespace Prefix:	us-gaap
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Balance Type:	debit
Period Type:	duration

X

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

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Balance Type:	debit
Period Type:	duration

X

- Definition

Foreign sales tax receivable.

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Namespace Prefix:	vdsi
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration