Quarterly report pursuant to Section 13 or 15(d)

Cover Page

v3.20.1
Cover Page - shares
3 Months Ended
Mar. 31, 2020
Apr. 30, 2020
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2020  
Document Transition Report false  
Entity File Number 000-26427  
Entity Registrant Name Stamps.com Inc  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 77-0454966  
Entity Address, Address Line One 1990 E. Grand Avenue  
Entity Address, City or Town El Segundo  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 90245  
City Area Code 310  
Local Phone Number 482-5800  
Title of 12(b) Security Common Stock, par value $0.001 per share  
Trading Symbol STMP  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   17,085,036
Entity Central Index Key 0001082923  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q1  
Amendment Flag false