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Investment in Mast Therapeutics, Inc (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Apr. 08, 2011
SynthRx, Inc. [Member]
Mar. 31, 2013
Mast Therapeutics, Inc. [Member]
Jun. 06, 2012
Mast Therapeutics, Inc. [Member]
Oct. 11, 2011
Mast Therapeutics, Inc. [Member]
Apr. 08, 2011
Mast Therapeutics, Inc. [Member]
Schedule of Equity Method Investment [Line Items]              
Equity investment, ownership percentage (in hundredths)     19.10%        
Common stock received in acquiring company upon acquisition of equity method investee (in shares)             126,000
Proceeds from sale of common stock in acquiring entity         $ 17,900 $ 112,200  
Additional shares of common stock held in an escrow potentially issuable (in shares)         38,196    
Additional number of shares received (in shares) 92,566            
Investment in Mast Therapeutics, at market $ 62,945 $ 0          
Additional shares of common stock potentially issuable from development milestones, maximum (in shares)       2,800,000