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STOCKHOLDERS' EQUITY AND SHARE-BASED COMPENSATION EXPENSE (Tables)
 9 Months Ended
Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based compensation expense
The Company recognized share-based compensation expense as follows (in thousands):

 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
Costs of product sales
$
687

 
$
223

 
$
1,884

 
$
651

Research and development
599

 
340

 
1,743

 
906

Selling, general and administrative
1,877

 
1,436

 
5,809

 
3,552

Total share-based compensation expense
$
3,163

 
$
1,999

 
$
9,436

 
$
5,109