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SEC Filings

Document and Entity Information
3 Months Ended
Mar. 31, 2013
May 13, 2013
Document And Entity Information [Abstract]    
Entity Registrant Name Mast Therapeutics, Inc.  
Entity Central Index Key 0001160308  
Document Type 10-Q  
Document Period End Date Mar. 31, 2013  
Amendment Flag false  
Document Fiscal Year Focus 2013  
Document Fiscal Period Focus Q1  
Current Fiscal Year End Date --12-31  
Entity Filer Category Smaller Reporting Company  
Entity Common Stock, Shares Outstanding   46,265,286