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STOCK-BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 2017
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,

 

 

    

2017

    

2016

    

2017

    

2016

 

Cost of sales

 

$

39

 

$
8

 

$

75

 

$
16

 

Research and development expense

 

 

260

 

 
131

 

 

607

 

 
208

 

Selling, general and administrative expense

 

 

3,104

 

 
4,189

 

 

6,277

 

 
8,014

 

Total

 

$

3,403

 

$
4,328

 

$

6,959

 

$
8,238