XML 17 R1.htm IDEA: XBRL DOCUMENT v3.7.0.1
Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2017
Apr. 30, 2017
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2017  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q1  
Trading Symbol ttd  
Entity Registrant Name TRADE DESK, INC.  
Entity Central Index Key 0001671933  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Class A common stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   22,511,147
Class B common stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   17,444,038