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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2015
Calculation of Fair Value Assumptions Using Black Scholes Option Model

The estimated fair values of employee stock options granted during the nine months ended September 30, 2015 and 2014, were determined on the date of grant using the Black-Scholes option-pricing model with the following assumptions:

 

     Three Months Ended
September 30,
    Nine Months Ended
September 30,
 
     2015     2014     2015      2014  

Expected option life (years)

     6.22        5.96       6.22         5.96   

Risk-free interest rate

     1.94     1.78     1.79% -2.12%         1.54% -1.78%   

Expected volatility

     77.0     134     76.0% -132.0%         131% -134%   

Expected dividend yield

Summary of Stock Option Activity

The following table summarizes stock option activity for the nine months ended September 30, 2015:

 

    Number of
Options
    Weighted-
Average
Exercise
Price
    Weighted-
Average
Remaining
Contractual
Term
(Years)
    Aggregate
Intrinsic
Value
 

Outstanding — December 31, 2014

    732,823      $ 2.08        6.73      $ 5,508   

Granted

    1,540,388      $ 11.51       

Options assumed in Merger

    24,400      $ 14.07       

Exercised

    (71,323   $ 2.12       

Forfeited or expired

    (2,018   $ 2.12       
 

 

 

       

Outstanding — September 30, 2015

    2,224,270      $ 8.75        8.65      $ 1,875   

Exercisable — September 30, 2015

    813,167      $ 4.61        6.95      $ 1,706   

Vested and expected to vest — September 30, 2015

Summary of Restricted Stock Unit Activity

The following table summarizes RSU activity for the nine months ended September 30, 2015:

 

     Number of
Units
     Weighted-
Average
Grant Date
Fair Value
     Total
Grant Date
Fair Value
 

Outstanding — December 31, 2014

     —         $ —         $ —     

Granted

     339,426       $ 12.43         4,220   

Vested

     (180,090    $ 12.65         (2,278

Forfeited or expired

     —           —           —     
  

 

 

    

 

 

    

 

 

 

Outstanding — September 30, 2015

     159,336       $ 12.18       $ 1,942   
  

 

 

    

 

 

    

 

 

 

 

Stock-Based Compensation Expense

The following table presents total stock-based compensation expense for the three and nine months ended September 30, 2015:

 

     Three Months Ended
September 30,
     Nine Months Ended
September 30,
 
         2015              2014          2015      2014  

Research and development

   $ 164       $ 37       $ 225       $ 141   

General and administrative

     2,277         13         4,047         54   
  

 

 

    

 

 

    

 

 

    

 

 

 

Total stock based compensation expense

   $ 2,441       $ 50       $ 4,272       $ 195   
  

 

 

    

 

 

    

 

 

    

 

 

 

 

Hercules Warrants [Member]  
Calculation of Fair Value Assumptions Using Black Scholes Option Model

The fair value of the warrants was determined using the Black-Scholes option pricing model, using the following assumptions:

 

Exercise price

   $ 8.35   

Fair value of underlying stock

   $ 11.80   

Expected volatility

     72.52

Contractual term

     5 years   

Risk-free interest rate

     1.68

Expected dividend yield

     0
MTS Warrants [Member]  
Calculation of Fair Value Assumptions Using Black Scholes Option Model

The fair value of the warrant was determined using the Black-Scholes option pricing model, using the following assumptions:

 

Exercise price

   $ 11.80   

Fair value of underlying stock

   $ 11.80   

Expected volatility

     72.0

Contractual term

     5 years   

Risk-free interest rate

     1.54

Expected dividend yield

     0