$1.29

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SEC Filings

v3.3.1.900
Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Mar. 10, 2016
Jun. 30, 2015
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2015    
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY    
Entity Registrant Name Mast Therapeutics, Inc.    
Entity Central Index Key 0001160308    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Smaller Reporting Accelerated Filer    
Trading Symbol MSTX    
Entity Common Stock, Shares Outstanding   192,836,367  
Entity Public Float     $ 77.0