Investment in Mast Therapeutics, Inc. (Details) (USD $)	Jun. 30, 2013	Jan. 31, 2013	Apr. 08, 2011 SynthRx, Inc. [Member]	Sep. 30, 2014 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)	47,745	92,566
Investment in Mast Therapeutics, at market	$ 60,566
Additional shares of common stock potentially issuable from development milestones, maximum (in shares)				2,800,000