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Condensed Consolidated Statements of Cash Flows (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012
Statement Of Cash Flows [Abstract] |  |
Shares issued as consideration under an equity financing agreement | 329,131 |
Right to sell of common stock | $ 30 |
Restricted Common Stock issued to developer of biological material |  | 24,753
Warrants termination agreement | 2013-10 |

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- Definition Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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