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Loan Payable - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Oct. 31, 2013
Jul. 31, 2013
CIRM Loan Agreement [Member]
Apr. 30, 2013
CIRM Loan Agreement [Member]
Sep. 30, 2012
CIRM Loan Agreement [Member]
Dec. 31, 2013
CIRM Loan Agreement [Member]
Jan. 31, 2014
Subsequent Events [Member]
CIRM Loan Agreement [Member]
Dec. 31, 2013
Silicon Valley Bank Loan Agreement Warrant [Member]
Dec. 31, 2013
Silicon Valley Bank Loan Agreement Warrant [Member]
Common Stock [Member]
Apr. 30, 2013
Silicon Valley Bank [Member]
Dec. 31, 2013
Silicon Valley Bank [Member]
Debt Instrument [Line Items]                      
Proceeds from loan $ 13,820,264         $ 3,820,264       $ 9,900,000 $ 10,000,000
Loan term 3 years       10 years 10 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                    
Term of warrants expiration               10 years      
Number of shares of common stock acquired using warrants                 293,531    
Exercise price of warrants   1.80           1.7034      
Warrants expiration period               April 2023      
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                    
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 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     $ 3,800,000     $ 3,800,000 $ 3,800,000