Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

v2.4.1.9
Document and Entity Information (USD $)
12 Months Ended
Dec. 31, 2014
Feb. 27, 2015
Jun. 30, 2014
Document and Entity Information [Abstract]      
Entity Registrant Name STAMPS.COM INC    
Entity Central Index Key 0001082923    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Accelerated Filer    
Entity Public Float     $ 480,718,129dei_EntityPublicFloat
Entity Common Stock, Shares Outstanding   16,318,208dei_EntityCommonStockSharesOutstanding  
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2014