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SEC Filings

v2.4.0.8
Document and Entity Information
6 Months Ended
Jun. 30, 2015
Aug. 10, 2015
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2015  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q2  
Entity Registrant Name Mast Therapeutics, Inc.  
Entity Central Index Key 0001160308  
Trading Symbol MSTX  
Current Fiscal Year End Date --12-31  
Entity Filer Category Smaller Reporting Company  
Entity Common Stock, Shares Outstanding   163,614,297