Document and Entity Information
6 Months Ended
Jun. 30, 2015
Jul. 27, 2015
Document and Entity Information    
Entity Registrant Name VIVUS INC  
Entity Central Index Key 0000881524  
Document Type 10-Q  
Document Period End Date Jun. 30, 2015  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   104,021,069
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q2