Document And Entity Information - shares
 6 Months Ended
Jun. 30, 2015
Aug. 14, 2015
Document Information [Line Items]    
Entity Registrant Name RMG Networks Holding Corp  
Document Type 10-Q  
Current Fiscal Year End Date --12-31  
Entity Common Stock, Shares Outstanding   36,882,041
Amendment Flag false  
Entity Central Index Key 0001512074  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Filer Category Smaller Reporting Company  
Entity Well-known Seasoned Issuer No  
Document Period End Date Jun. 30, 2015  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q2  
Symon Holdings Corporation [Member]    
Document Information [Line Items]    
Entity Registrant Name Symon Holdings Corp  
Current Fiscal Year End Date --01-31  
Entity Central Index Key 0001342461  
Entity Filer Category Smaller Reporting Company