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California Institute for Regenerative Medicine Funding Program (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Jul. 31, 2012
Spinal Cord Injury [Member]
California institute for regenerative medicine funding program
Approval of Fund by California Institute for Regenerative Medicine (CIRM)		$ 20
Approval of Fund by California Institute for Regenerative Medicine (CIRM) maximum period	4 years
Alzheimer's disease [Member]
California institute for regenerative medicine funding program
Approval of Fund by California Institute for Regenerative Medicine (CIRM)	20
Approval of Fund by California Institute for Regenerative Medicine (CIRM) maximum period	4 years

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