$1.29

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SEC Filings

v2.4.0.6
Document and Entity Information (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Mar. 08, 2013
Jun. 29, 2012
Document And Entity Information [Abstract]      
Entity Registrant Name Mast Therapeutics, Inc.    
Entity Central Index Key 0001160308    
Document Type 10-K    
Document Period End Date Dec. 31, 2012    
Amendment Flag false    
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Smaller Reporting Company    
Entity Public Float     $ 24.0
Entity Common Stock, Shares Outstanding   46,265,286