Sales of BioTime Common Shares by Subsidiaries	9 Months Ended
Sep. 30, 2014
Sales of BioTime Common Shares by Subsidiaries (Details) [Abstract]
Sales of BioTime Common Shares by Subsidiaries	10. Sales of BioTime Common Shares by Subsidiaries Certain BioTime subsidiaries hold BioTime common shares that the subsidiaries received from BioTime in exchange for capital stock in the subsidiaries. The BioTime common shares held by subsidiaries are treated as treasury stock by BioTime and BioTime does not recognize a gain or loss on the sale of those shares by its subsidiaries. See also Note 12. During June 2014, Asterias sold 5,000,000 of its BioTime common shares with warrants to purchase 5,000,000 shares of Asterias Series B common stock to two investors for $12,500,000 in cash. Broadwood Partners, L.P., BioTime’s largest shareholder, purchased 1,000,000 of the BioTime common shares with 1,000,000 Asterias warrants. One of BioTime’s directors, Neal C. Bradsher, is President of Broadwood Partners, L.P., the investment manager of Broadwood Partners, L.P., and one of Asterias’ directors, Richard T. LeBuhn, is Senior Vice President of Broadwood Capital, Inc. The other 4,000,000 BioTime common shares with 4,000,000 Asterias warrants were purchased by a trust previously established by George Karfunkel. Mr. Karfunkel beneficially owns more than 5% of the outstanding common shares of BioTime. Asterias allocated the proceeds received from the sale of the BioTime common stock and Asterias warrants based on their relative fair values resulting in $9,316,109 and $3,183,891 of the proceeds being allocated to the common shares and warrants, respectively.

10. Sales of BioTime Common Shares by Subsidiaries

Certain BioTime subsidiaries hold BioTime common shares that the subsidiaries received from BioTime in exchange for capital stock in the subsidiaries. The BioTime common shares held by subsidiaries are treated as treasury stock by BioTime and BioTime does not recognize a gain or loss on the sale of those shares by its subsidiaries. See also Note 12.

During June 2014, Asterias sold 5,000,000 of its BioTime common shares with warrants to purchase 5,000,000 shares of Asterias Series B common stock to two investors for $12,500,000 in cash. Broadwood Partners, L.P., BioTime’s largest shareholder, purchased 1,000,000 of the BioTime common shares with 1,000,000 Asterias warrants. One of BioTime’s directors, Neal C. Bradsher, is President of Broadwood Partners, L.P., the investment manager of Broadwood Partners, L.P., and one of Asterias’ directors, Richard T. LeBuhn, is Senior Vice President of Broadwood Capital, Inc. The other 4,000,000 BioTime common shares with 4,000,000 Asterias warrants were purchased by a trust previously established by George Karfunkel. Mr. Karfunkel beneficially owns more than 5% of the outstanding common shares of BioTime. Asterias allocated the proceeds received from the sale of the BioTime common stock and Asterias warrants based on their relative fair values resulting in $9,316,109 and $3,183,891 of the proceeds being allocated to the common shares and warrants, respectively.