XML 12 R1.htm IDEA: XBRL DOCUMENT v3.19.2
Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2019
Jul. 16, 2019
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Trading Symbol MSTR  
Entity Registrant Name MICROSTRATEGY INC  
Entity Central Index Key 0001050446  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Current Reporting Status Yes  
Entity Shell Company false  
Entity File Number 000-24435  
Entity Tax Identification Number 510323571  
Entity Address, Address Line One 1850 Towers Crescent Plaza  
Entity Address, City or Town Tysons Corner  
Entity Address, State or Province VA  
Entity Address, Postal Zip Code 22182  
City Area Code (703)  
Local Phone Number 848-8600  
Class A    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   8,204,395
Class B    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   2,035,184