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v3.20.1

Commitments and Contingencies - (Fanapt) - Additional Information (Detail) | 3 Months Ended
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Mar. 31, 2020
November 16,2016 through December 31,2019 |
Fanapt |
Royalty payable percentage on net sales | 3.00%
Fanapt® |
Fanapt |
Royalty payable percentage on net sales | 6.00%
Royalty payment period | 10 years

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- Definition Fanapt [Abstract] + References No definition available. + Details
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Namespace Prefix: | vnda_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Royalty payable percentage under a contractual arrangement for use of technology or intellectual property. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Royalty Period + References No definition available. + Details
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Namespace Prefix: | vnda_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | vnda_StatementScenarioSecondaryAxis=vnda_ScenarioFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=vnda_FanaptMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |