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Loan Payable - Additional Information (Detail) - USD ($)	1 Months Ended		12 Months Ended	14 Months Ended
	Feb. 28, 2015	Apr. 30, 2013	Dec. 31, 2015	Aug. 31, 2014	Apr. 30, 2015	Dec. 31, 2014	Jul. 31, 2014	Oct. 31, 2013
Debt Instrument [Line Items]
Loan term			3 years
Annual interest rate on loan			6.00%
Final fee payment at the end of loan term			$ 1,000,000
Exercise price of warrants					$ 0.85		$ 2.17	$ 1.80
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%
Common Stock [Member]
Debt Instrument [Line Items]
Number of shares of common stock acquired using warrant						1,180,015
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%
Minimum cash proceeds from investors required to release pledged restricted money market account			$ 18,000,000
Silicon Valley Bank Loan Agreement [Member] | Restricted Money Market Account [Member]
Debt Instrument [Line Items]
Debt instrument, collateral amount			2,422,500
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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