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California Institute for Regenerative Medicine Loan (Details Textual) (USD $) In Millions, unless otherwise specified	1 Months Ended
	Apr. 30, 2013	Sep. 30, 2012	Jul. 31, 2012 Spinal Cord Injury [Member]	Sep. 30, 2012 Alzheimer's disease [Member]
California Institute for Regenerative Medicine Loan (Textual) [Abstract]
Approval of Fund by California Institute for Regenerative Medicine (CIRM)	$ 19.3		$ 20.0
Approval of Fund by California Institute for Regenerative Medicine (CIRM) maximum period			4 years	4 years
Loan term		10 years

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Approval of fund to collaborators maximum validation period.

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Loan term.

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