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Commitments and Contingencies - Fanapt - Additional Information (Detail) - Fanapt® | 12 Months Ended | 60 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Fanapt |  |
Royalty payable percentage on net sales | 6.00% |
Royalty payment period | 10 years |
November 16,2016 through December 31,2019 |  |
Fanapt |  |
Royalty payable percentage on net sales |  | 3.00%

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

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |