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Loan Payable - Additional Information (Detail) - USD ($)	1 Months Ended		9 Months Ended	14 Months Ended
	Feb. 28, 2015	Apr. 30, 2013	Sep. 30, 2015	Aug. 31, 2014
Silicon Valley Bank Loan Agreement Warrant [Member]
Debt Instrument [Line Items]
Term of warrant			10 years
Exercise price of warrants			$ 1.7034
Warrant expiration period			2023-04
Silicon Valley Bank Loan Agreement Warrant [Member] | Common Stock [Member]
Debt Instrument [Line Items]
Number of shares of common stock acquired using warrant			293,531
Silicon Valley Bank Loan Agreement [Member]
Debt Instrument [Line Items]
Proceeds from loan		$ 9,900,000
Cash discount		100,000	$ 100,000
Loan term			3 years
Annual interest rate on loan			6.00%
Period of loan subject to interest payments only			6 months
Period of loan subject to principal and interest payments			30 months
Final fee payment at the end of loan term			$ 1,000,000
Proceeds received under loan agreement			9,900,000
Initial carrying amount assigned to loan, net of discount			9,512,000
Fair value allocated to warrant			388,000
Note issuance costs			$ 117,000
Deferred financing costs, discount and accretion percentage			9.00%
CIRM Loan Agreement [Member]
Debt Instrument [Line Items]
Approval of fund by California Institute for Regenerative Medicine (CIRM)		$ 19,300,000
Aggregate proceeds from disbursement of the loan				$ 9,600,000
Forgiveness of loan principal			$ 8,917,000
Accrued interest forgiven			$ 243,000
Repayment of aggregate loan proceeds received	$ 679,000

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