XML 11 R1.htm IDEA: XBRL DOCUMENT v3.24.1.u1
Cover - shares
 3 Months Ended
Mar. 31, 2024
May 02, 2024
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2024  
Document Transition Report false  
Entity File Number 001-34186  
Entity Registrant Name VANDA PHARMACEUTICALS INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 03-0491827  
Entity Address, Address Line One 2200 Pennsylvania Avenue NW  
Entity Address, Address Line Two Suite 300E  
Entity Address, City or Town Washington  
Entity Address, State or Province DC  
Entity Address, Postal Zip Code 20037  
City Area Code 202  
Local Phone Number 734-3400  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   58,198,273
Entity Central Index Key 0001347178  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Common Stock    
Document Information [Line Items]    
Title of 12(b) Security Common Stock, par value $0.001 per share  
Trading Symbol VNDA  
Security Exchange Name NASDAQ  
Series A Junior Participating Preferred Stock Purchase Right    
Document Information [Line Items]    
Title of 12(b) Security Series A Junior Participating Preferred Stock Purchase Right, par value $0.001 per share  
Security Exchange Name NASDAQ  
No Trading Symbol Flag true