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Income Taxes - Valuation Allowance Activity on Deferred Tax Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Deferred Tax Assets, Valuation Allowance [Roll Forward] |  |  |
Balance at Beginning of Year | $ 8,155 | $ 111,950 | $ 116,110
Additions | 0 | 0 | 4,036
Reductions | (1,104) | (103,795) | (8,196)
Balance at End of Year | $ 7,051 | $ 8,155 | $ 111,950

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of decrease in the period related to valuation allowance for deferred tax assets. + References No definition available. + Details
Name: | vnda_DeferredTaxAssetsValuationAllowanceDecrease
Namespace Prefix: | vnda_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of increase in the period related to valuation allowance for deferred tax assets. + References No definition available. + Details
Name: | vnda_DeferredTaxAssetsValuationAllowanceIncrease
Namespace Prefix: | vnda_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Deferred Tax Assets, Valuation Allowance + References No definition available. + Details
Name: | vnda_DeferredTaxAssetsValuationAllowanceRollForward
Namespace Prefix: | vnda_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration