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Loan Payable - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended			1 Months Ended					3 Months Ended	9 Months Ended			1 Months Ended	3 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Jul. 31, 2014	Sep. 30, 2014 Common Stock [Member]	Aug. 31, 2014 CIRM [Member]	Jan. 31, 2014 CIRM [Member]	Jul. 31, 2013 CIRM [Member]	Apr. 30, 2013 CIRM [Member]	Sep. 30, 2012 CIRM [Member]	Sep. 30, 2014 CIRM [Member]	Sep. 30, 2014 CIRM [Member]	Sep. 30, 2014 Silicon Valley Bank Loan Agreement Warrant [Member]	Sep. 30, 2014 Silicon Valley Bank Loan Agreement Warrant [Member] Common Stock [Member]	Apr. 30, 2013 Silicon Valley Bank [Member]	Sep. 30, 2014 Silicon Valley Bank [Member]
Debt Instrument [Line Items]
Proceeds from loan	$ 1,955,279									$ 1,955,279				$ 9,900,000
Loan term		3 years							10 years
Annual interest rate on loan	6.00%	6.00%
Period of loan subject to interest payments only		9 months
Period of loan subject to principal and interest payments		30 months
Final fee payment at the end of loan term		1,000,000
Term of warrant expiration												10 years
Number of shares of common stock acquired using warrant				330,015									293,531
Exercise price of warrant			$ 2.17									$ 1.7034
Warrant expiration period												April 2023
Proceeds received under loan agreement		9,900,000
Initial carrying amount assigned to loan, net of discount	9,512,000	9,512,000
Fair value allocated to warrant	388,000	388,000
Cash discount	100,000	100,000
Note issuance costs		117,000
Deferred financing costs, discount and accretion percentage		9.00%
Approval of fund by California Institute for Regenerative Medicine (CIRM)								19,300,000
Approval of fund by California Institute for Regenerative Medicine (CIRM) maximum period									4 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%
Proceeds from initial disbursement of the loan					$ 2,000,000	$ 3,800,000	$ 3,800,000

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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