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California Institute for Regenerative Medicine Loan - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended		6 Months Ended
	Apr. 30, 2013	Sep. 30, 2012	Jun. 30, 2013
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Approval of fund by California Institute for Regenerative Medicine (CIRM)	$ 19.3
Loan term		10 years
Loan interest rate description			one year LIBOR rate plus two percent
LIBOR rate plus percentage			2.00%
LIBOR rate plus percentage increase			1.00%
Alzheimers Disease [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Approval of fund by California Institute for Regenerative Medicine (CIRM) maximum period		4 years
Spinal Cord Injury [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Approval of fund by California Institute for Regenerative Medicine (CIRM) maximum period	4 years

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Incremental percentage increase (decrease) in the stated rate on a debt instrument.

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Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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