Investments in RXi and ADVENTRX Pharmaceuticals	12 Months Ended
Investments in RXi and ADVENTRX Pharmaceuticals	Dec. 31, 2011
Investments in RXi and ADVENTRX Pharmaceuticals [Abstract]
Investments in RXi and ADVENTRX Pharmaceuticals	12. Investments in RXi and ADVENTRX Pharmaceuticals In March 2010, the Company received proceeds from the redemption of 675,000 shares of common stock of its former subsidiary, RXi Pharmaceuticals Corporation, or RXi, for a total of $3.8 million. In June 2010, the Company sold 2.0 million common shares of RXi and in December 2010, disposed of its remaining RXi shares for approximately $6.9 million. On April 8, 2011, 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 ADVENTRX, which it sold on October 11, 2011 for $112,200. The Company will be entitled to receive an additional 37,000 shares of common stock of ADVENTRX currently held in an escrow established in connection with the acquisition, except to the extent the shares are applied to satisfy potential indemnification obligations to ADVENTRX. If all of the development milestones under the acquisition agreement were to be achieved, the Company also would be entitled to receive up to 2.9 million additional ADVENTRX shares. The Company's ADVENTRX shares are “restricted” securities within the meaning of the federal securities laws and are subject to certain transfer and voting restrictions under a Stockholders' Voting and Transfer Restriction Agreement.

The entire disclosure for equity investment, or group of investments, for which combined disclosure is appropriate, including: (a) the name of each investee and percentage of ownership of common stock, (b) accounting policies for investments in common stock, (c) difference between the amount at which the investment is carried and the amount of underlying equity in net assets and the accounting treatment of the difference, (d) the total fair value of each identified investment for which a market value is available, (e) summarized information as to assets, liabilities, and results of operations of the investees (for investments in unconsolidated subsidiaries, common stock of joint ventures, or other investments using the equity method), and (f) material effects of possible conversions, exercises, or contingent issuances of the investee. Other disclosures include (a) the names of any investee in which the investor owns 20 percent or more of the voting stock and investment is not accounted for using the equity method, and the reasons why not, and (b) the names of any investee in which the investor owns less than 20 percent of the voting stock and the investment is accounted for using the equity method, and the reasons why it is.

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