Share Exchange and Contribution Agreement	12 Months Ended
Dec. 31, 2013
Share Exchange and Contribution Agreement [Abstract]
Share Exchange and Contribution Agreement	14. Share Exchange and Contribution Agreement On July 24, 2012, LifeMap Sciences entered into a Share Exchange and Contribution Agreement (the “LifeMap Agreement”) with Alfred D. Kingsley, the chairman of BioTime’s board of directors and a company that he controls, Greenway Partners, L.P. (“Greenway”), pursuant to which Mr. Kingsley and Greenway agreed to contribute to LifeMap Sciences, in the aggregate, BioTime common shares having an aggregate value of not less than $2,000,000 and not more than $3,000,000, determined as provided in the LifeMap Agreement, in exchange for shares of LifeMap Sciences common stock at an initial price of $1.75 per LifeMap Sciences share. Under the LifeMap Agreement, during July 2012 Mr. Kingsley and Greenway contributed 420,000 BioTime shares to LifeMap Sciences and received in exchange 1,143,864 shares of LifeMap Sciences common stock. During December 2012, Mr. Kingsley and Greenway contributed an additional 172,533 BioTime Shares to LifeMap Sciences and received in exchange 427,566 shares of LifeMap Sciences common stock. The number of shares of LifeMap Sciences common stock issued in exchange for the BioTime shares was determined by multiplying the number of BioTime shares contributed by the highest weighted average closing price per share on the NYSE MKT for any ten trading days during the period from July 1, 2012 through July 31, 2012, in the case of the shares exchanged during July, and during the period August 1, 2012 through December 15, 2012 in the case of the shares exchanged during December, and dividing that amount by $1.75, which was the Exchange Price per share of LifeMap Sciences common stock. See Note 8. As a result of this investment, and a sale of 142,857 additional shares of LifeMap Sciences for cash, our ownership dropped from 86.30% to 73.20% as of December 31, 2012. As of December 31, 2012, the 513,935 BioTime shares held by LifeMap Sciences are presented as treasury stock at a cost of $2,375,397. There has been no change in ownership during 2013. BioTime registered the BioTime Shares received by LifeMap Sciences during July 2012, and has agreed to register the additional shares received during December 2012, for sale under the Securities Act. In accordance with the License and Research Assignment Agreement dated May 14, 2012 between Yeda Research and Development Company, Ltd (“Yeda”) and BioTime in connection with the merger of XenneX, Inc. and LifeMap Sciences Yeda was entitled to receive additional shares of LifeMap Sciences common stock as a result of the issuance of additional shares of common stock by LifeMap Sciences during 2012 to permit Yeda to maintain their 3.75% ownership in the issued and outstanding LifeMap Sciences shares on a fully diluted basis. LifeMap Sciences issued Yeda 66,791 shares of LifeMap Sciences common stock with an estimated fair value of $117,000 under that provision of the License and Research Assignment Agreement.

14. Share Exchange and Contribution Agreement

On July 24, 2012, LifeMap Sciences entered into a Share Exchange and Contribution Agreement (the “LifeMap Agreement”) with Alfred D. Kingsley, the chairman of BioTime’s board of directors and a company that he controls, Greenway Partners, L.P. (“Greenway”), pursuant to which Mr. Kingsley and Greenway agreed to contribute to LifeMap Sciences, in the aggregate, BioTime common shares having an aggregate value of not less than $2,000,000 and not more than $3,000,000, determined as provided in the LifeMap Agreement, in exchange for shares of LifeMap Sciences common stock at an initial price of $1.75 per LifeMap Sciences share.

Under the LifeMap Agreement, during July 2012 Mr. Kingsley and Greenway contributed 420,000 BioTime shares to LifeMap Sciences and received in exchange 1,143,864 shares of LifeMap Sciences common stock. During December 2012, Mr. Kingsley and Greenway contributed an additional 172,533 BioTime Shares to LifeMap Sciences and received in exchange 427,566 shares of LifeMap Sciences common stock. The number of shares of LifeMap Sciences common stock issued in exchange for the BioTime shares was determined by multiplying the number of BioTime shares contributed by the highest weighted average closing price per share on the NYSE MKT for any ten trading days during the period from July 1, 2012 through July 31, 2012, in the case of the shares exchanged during July, and during the period August 1, 2012 through December 15, 2012 in the case of the shares exchanged during December, and dividing that amount by $1.75, which was the Exchange Price per share of LifeMap Sciences common stock. See Note 8.

As a result of this investment, and a sale of 142,857 additional shares of LifeMap Sciences for cash, our ownership dropped from 86.30% to 73.20% as of December 31, 2012. As of December 31, 2012, the 513,935 BioTime shares held by LifeMap Sciences are presented as treasury stock at a cost of $2,375,397. There has been no change in ownership during 2013.

BioTime registered the BioTime Shares received by LifeMap Sciences during July 2012, and has agreed to register the additional shares received during December 2012, for sale under the Securities Act.

In accordance with the License and Research Assignment Agreement dated May 14, 2012 between Yeda Research and Development Company, Ltd (“Yeda”) and BioTime in connection with the merger of XenneX, Inc. and LifeMap Sciences Yeda was entitled to receive additional shares of LifeMap Sciences common stock as a result of the issuance of additional shares of common stock by LifeMap Sciences during 2012 to permit Yeda to maintain their 3.75% ownership in the issued and outstanding LifeMap Sciences shares on a fully diluted basis. LifeMap Sciences issued Yeda 66,791 shares of LifeMap Sciences common stock with an estimated fair value of $117,000 under that provision of the License and Research Assignment Agreement.