v3.5.0.2
Document and Entity Information - shares
6 Months Ended
Jul. 02, 2016
Aug. 02, 2016
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jul. 02, 2016  
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q2  
Trading Symbol IVAC  
Entity Registrant Name INTEVAC INC  
Entity Central Index Key 0001001902  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   20,923,678