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SEC Filings

v2.4.0.6
Document and Entity Information
3 Months Ended
Mar. 31, 2013
Entity Information [Line Items]  
Document Type S-1/A
Amendment Flag false
Document Period End Date Mar. 31, 2013
Trading Symbol MSTX
Entity Registrant Name Mast Therapeutics, Inc.
Entity Central Index Key 0001160308
Entity Filer Category Smaller Reporting Company