Document And Entity Information (USD $)
 12 Months Ended
Dec. 31, 2014
Feb. 28, 2015
Jun. 30, 2014
Document and Entity Information [Abstract]      
Entity Registrant Name INPHI CORP    
Document Type 10-K    
Current Fiscal Year End Date --12-31    
Entity Common Stock, Shares Outstanding   37,864,922  
Entity Public Float     $ 458,000,000
Amendment Flag false    
Entity Central Index Key 0001160958    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Well-known Seasoned Issuer No    
Document Period End Date Dec. 31, 2014    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY