XML 83 R27.htm IDEA: XBRL DOCUMENT v3.2.0.727
Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2015
Calculation of Fair Value Assumptions Using Black Scholes Option Model

The estimated fair values of employee stock options granted during the six months ended June 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 June 30,   Six Months Ended June 30,
     2015   2014   2015   2014

Expected option life (years)

   1.48 - 6.12   5.96     1.48 - 6.22   5.96

Risk-free interest rate

   0.68% - 1.91%   1.54%   0.68% - 1.91%   1.54% - 1.57%

Expected volatility

   65.85% - 73.33%   133%   73.33% - 132.0%   131% - 133%

Expected dividend yield

   0%       0%       0%   0%
Summary of Stock Option Activity

The following table summarizes stock option activity for the six months ended June 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

     1,299,251       $ 11.56         

Options assumed in Merger

     24,400       $ 14.07         

Exercised

     (70,988    $ 2.11         

Forfeited or expired

     (2,016    $ 2.16         
  

 

 

          

Outstanding—June 30, 2015

     1,983,470       $ 8.44         9.07       $ 4,339   

Exercisable—June 30, 2015

     694,942       $ 3.73         7.71       $ 5,582   

Vested or expected to vest—June 30, 2015

     1,888,088       $ 8.31         9.03       $ 6,535   
Stock-Based Compensation Expense Related to Option Awards

The following table presents the stock-based compensation expense related to option awards for the three and six months ended June 30:

 

     Three Months Ended June 30,      Six Months Ended June 30,  
     2015      2014      2015      2014  

Research and development

   $ 50       $ 40       $ 81       $ 105   

General and administrative

     2,661         15         2,664         41   
  

 

 

    

 

 

    

 

 

    

 

 

 

Total stock based compensation expense

   $ 2,711       $ 55       $ 2,745       $ 146   
  

 

 

    

 

 

    

 

 

    

 

 

 
Summary of Restricted Stock Unit Activity

The following table summarizes stock RSU activity for the six months ended June 30, 2015:

 

     Number of
Units
     Weighted-
Average
Grant Date

Fair Value
     Total
Grant Date
Fair Value
 

Outstanding—December 31, 2014

     —         $ —         $ —     

Granted

     329,052       $ 12.65         4,163   

Vested

     (130,435    $ 12.65         (1,650

Forfeited or expired

     —           —           —     
  

 

 

    

 

 

    

 

 

 

Outstanding—June 30, 2015

     198,617       $ 12.65       $ 2,513   
  

 

 

    

 

 

    

 

 

 
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