Name:	us-gaap_ClassOfStockLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Period Type:	duration

Exercise price per share or per unit of warrants or rights outstanding.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Data Type:	xbrli:sharesItemType
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Class Of Warrant Or Right, Number Of Warrants Exercised

No definition available.

Name:	vldr_ClassOfWarrantOrRightNumberOfWarrantsExercised
Namespace Prefix:	vldr_
Data Type:	xbrli:sharesItemType
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Period Type:	duration

Common Stock, Capital Shares Issued Through Warrant Exercises, Cumulative Amount

No definition available.