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Document and Entity Information
12 Months Ended
Dec. 31, 2014
Feb. 24, 2015
Document And Entity Information [Abstract]    
Document Type 8-K  
Amendment Flag false  
Document Period End Date Dec. 31, 2014  
Trading Symbol HSTM  
Entity Registrant Name HEALTHSTREAM INC  
Entity Central Index Key 0001095565  
Entity Common Stock, Shares Outstanding   27,683,412dei_EntityCommonStockSharesOutstanding