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Stock-Based Compensation
 3 Months Ended
Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation

4. Stock-Based Compensation

The Company uses the Black-Scholes option pricing model to calculate the fair value of stock option awards as of their grant date. Stock-based compensation expense for the three months ended March 31 was as follows (in thousands):

 

     Three Months Ended  
     March 31,  
     2016      2015  

Cost of revenues

    $ 52      $ 61  

Selling, general and administrative

      238        408  

Research and development

      39        94  
  

 

 

     

 

 

  

Total stock-based compensation

    $ 329      $ 563  
  

 

 

     

 

 

  

 

On December 31, 2010, the Company granted 2,984,250 non-qualified stock options under the VI Chip 2007 Stock Option and Incentive Plan with performance-based vesting provisions tied to achievement of certain margin targets by VI Chip Corporation. As of December 31, 2010, the Company determined it was probable the margin targets could be achieved and, accordingly, began recording stock-based compensation expense relating to these options beginning January 1, 2011. This determination remains the same as of March 31, 2016 and, accordingly, expense has been recorded through that date. The unrecognized compensation expense for these performance-based options was approximately $451,000 as of March 31, 2016.