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Loan Payable (Tables)
12 Months Ended
Dec. 31, 2015
Silicon Valley Bank Loan Agreement Warrant [Member]  
Assumptions Used for Black-Scholes Option Pricing Model

We estimated the fair value of the warrant to be approximately $388,000 using the Black-Scholes option pricing model with the following assumptions:

 

Expected life (years)

     10   

Risk-free interest rate

     1.9

Expected volatility

     88.1

Expected dividend yield

     0
Silicon Valley Bank [Member]  
Summary of Changes in Carrying Value of Loan Payable

The following table is a summary of the changes in the carrying value of our loan payable in 2015:

 

     Silicon Valley
Bank Loan
     CIRM Loan      Total  

Loan payable at December 31, 2014

   $ 5,424,610       $ 9,595,807       $ 15,020,417   

Repayment of principal

     (4,099,319      (679,166 )      (4,778,485

Accretion of discount

     92,097         —          92,097   
  

 

 

    

 

 

    

 

 

 

Carrying value of loan payable at 12/31/2015 (current and non-current)

   $ 1,417,388       $ 8,916,641       $ 10,334,029   
  

 

 

    

 

 

    

 

 

 

Carrying value of loan payable, current portion

   $ 1,417,388       $ —         $ 1,417,388   

Carrying value of loan payable, non-current portion

     —          8,916,641         8,916,641   
  

 

 

    

 

 

    

 

 

 

Total loan payable at December 31, 2015

   $ 1,417,388       $ 8,916,641       $ 10,334,029