XML 62 R36.htm IDEA: XBRL DOCUMENT v2.4.0.8
Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Employee Stock Option Activity and Related Information

A summary of the Company’s employee stock option activity and related information follows:

 

     Shares     Weighted-
average
exercise price
per share		      Weighted-
average
remaining
contractual
term (in years)		      Aggregate
intrinsic value
(in thousands)		  

Outstanding at December 31, 2012

      1,686,179     $ 2.28         8.59       $ 7,486   

Granted

      669,030       9.17         

Canceled

      (65,410 )      2.24         

Exercised

      (177,165 )      2.16         
  

 

 

          

Outstanding at December 31, 2013

      2,112,632      $ 4.47         8.12       $ 26,968   
  

 

 

          

December 31, 2013:

           

Options vested and expected to vest

      2,087,810      $ 4.46         8.11       $ 26,687   

Options exercisable

      872,414     $     2.48         7.39       $     12,875   
Company's Options Outstanding

The following table summarizes information about the Company’s options outstanding at December 31, 2013:

 

     Options Outstanding      Options Exercisable  

Exercise Price

    Number of
Shares		      Weighted-
Average
Remaining
Contractual
Life in Years		      Number of
Shares		      Weighted-
Average
Remaining
Contractual
Life in Years		  

$0.32 – 1.92

      862,856         8.18         416,309         8.13   

  2.24 – 3.84

      457,740         6.48         369,142         6.41   

  5.12 – 6.72

      418,030         8.35         85,309         7.92   

  8.96 – 12.50

      374,006         9.73         1,654        9.79  
  

 

 

        

 

 

     
     2,112,632            872,414      
  

 

 

        

 

 

     
Fair Value of Employee Option Grant

The fair value of each employee option grant as of December 31 was estimated on the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:

 

             2013                      2012                      2011          

Risk-free interest rates

      1.05%–1.95%         0.85%–1.44%         2.2%–3.14%   

Expected term (years)

      6.25         6.25         6.25   

Expected dividend yield

      —          —          —    

Volatility

      57.0%–58.0%         54.0%–61.0%         73.0%   
Stock Compensation Expense

Stock compensation expense for the years ended December 31 was as follows:

 

     2013      2012      2011  
     (In thousands)  

Cost of revenue

    $ 49       $ 71       $ 4   

Research and development

      273         204         26   

Selling, general and administrative

      823         470         213   
  

 

 

     

 

 

     

 

 

  

Total stock-based compensation expense

    $     1,145       $     745       $     243