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STOCK-BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 2016
STOCK-BASED COMPENSATION  
Schedule of stock-based compensation expense recognized for stock options, stock awards, restricted stock units and the Company's employee stock purchase program (ESPP)

The following table presents stock-based compensation expense recognized for stock options, stock awards, restricted stock units and the Company’s employee stock purchase program (ESPP) in the Company’s Condensed Consolidated Statements of Operations (in thousands):

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Three Months Ended June 30,

 

Six Months Ended June 30,

 

 

    

2016

    

2015

    

2016

    

2015

 

Cost of sales

 

$
8

 

$
4

 

$
16

 

$
5

 

Research and development expense

 

 
131

 

 
46

 

 
208

 

 
183

 

Selling, general and administrative expense

 

 
4,189

 

 
3,203

 

 
8,014

 

 
5,878

 

Total

 

$
4,328

 

$
3,253

 

$
8,238

 

$
6,066