Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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-Name Emerging Issues Task Force (EITF)

-Number 07-4

-Paragraph 4

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Diluted Earnings Per Share

-URI http://asc.fasb.org/extlink&oid=6510752

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Contingent Stock Agreement

-URI http://asc.fasb.org/extlink&oid=6508534

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-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6505113

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 128

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Accounting Standards Codification

-Topic 260

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+ Details

Organization and Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
	Dec. 31, 2012 Segment	Dec. 31, 2011	Dec. 31, 2010
Organization and Summary of Significant Accounting Policies (Textual) [Abstract]
Percentage of revenues	100.00%	100.00%	100.00%
Organization and Summary of Significant Accounting Policies (Additional Textual) [Abstract]
Stock options outstanding	9,184,346	8,346,190	8,109,901
Number of operating segments	1
California Institute for Regenerative Medicine [Member]
Organization and Summary of Significant Accounting Policies (Textual) [Abstract]
Percentage of revenues		18.00%
CHDI Foundation, Inc. [Member]
Organization and Summary of Significant Accounting Policies (Textual) [Abstract]
Percentage of revenues		11.00%
Shire AG [Member]
Organization and Summary of Significant Accounting Policies (Textual) [Abstract]
Percentage of revenues	51.00%
Sigma-Aldrich Corporation [Member]
Organization and Summary of Significant Accounting Policies (Textual) [Abstract]
Percentage of revenues	11.00%	15.00%	59.00%
Dow AgroSciences LLC [Member]
Organization and Summary of Significant Accounting Policies (Textual) [Abstract]
Percentage of revenues	22.00%	43.00%	21.00%
Maximum [Member]
Organization and Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful lives of related assets	5 years
Minimum [Member]
Organization and Summary of Significant Accounting Policies (Textual) [Abstract]
Estimated useful lives of related assets	3 years