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Inventory - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Inventory [Line Items]
Inventory	$ 10,181	$ 11,490
HETLIOZ®
Inventory [Line Items]
Inventory	7,100	8,000
Fanapt®
Inventory [Line Items]
Inventory	$ 3,000	$ 3,400

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_InventoryLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Inventory

+ References

No definition available.

+ Details

Name:	vnda_Inventory
Namespace Prefix:	vnda_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_PublicUtilitiesInventoryAxis=vnda_HetliozMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PublicUtilitiesInventoryAxis=vnda_FanaptMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: