Investment in Mast Therapeutics, Inc	6 Months Ended
Investment in Mast Therapeutics, Inc	Jun. 30, 2013
Investment in Mast Therapeutics, Inc. [Abstract]
Investment in Mast Therapeutics, Inc.	4. Investment in Mast Therapeutics, Inc. On April 8, 2011, Mast Therapeutics, Inc. (formerly ADVENTRX Pharmaceuticals) completed its acquisition of SynthRx, Inc., in which the Company held a 19.1% interest. As a result of the transaction, the Company received approximately 126,000 shares of common stock of Mast Therapeutics, which it sold on October 11, 2011 for $112,200, and in June 2012, the Company received an additional 38,196 shares of common stock of Mast Therapeutics that had been held in an escrow established in connection with the acquisition, which it sold on June 6, 2012 for $17,900. In January 2013, the Company received an additional 92,566 shares, and in June 2013, an additional 47,745 shares, which were all sold in June 2013 for $60,566. If all of the development milestones under the acquisition agreement were to be achieved, the Company also would be entitled to receive up to 2.8 million additional Mast Therapeutics shares. Our former interest in SynthRx had a zero carrying value.

The entire disclosure for equity method investments and joint ventures. Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee. Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group.

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