Document and Entity Information - shares
3 Months Ended
Jun. 30, 2019
Aug. 05, 2019
Document And Entity Information    
Entity Registrant Name THESTREET, INC.  
Entity Central Index Key 0001080056  
Document Type 10-Q  
Document Period End Date Jun. 30, 2019  
Amendment Flag false  
Current Fiscal Year End Date --03-31  
Entity File Number 000-25779  
Entity Incorporation, State or Country Code DE  
Entity Interactive Data Current Yes  
Entity's Reporting Status Current Yes  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Ex Transition Period false  
Entity Filer Category Non-accelerated Filer  
Entity Common Stock, Shares Outstanding   5,336,639
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2020