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Property and Equipment, net
 12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Property and Equipment, net
Property and Equipment, net
The principal categories of property and equipment, net at December 31, 2016 and 2015, respectively, are as follows: 
Property and Equipment, net:
 
2016
 
2015
 
 
 
 
 
Laboratory equipment
 
$
9,019

 
$
9,963

Office and computer equipment
 
2,519

 
2,968

Furniture, fixtures and fittings
 
4,239

 
4,315

Less - accumulated depreciation
 
(12,457
)
 
(14,630
)
Total
 
$
3,320

 
$
2,616

 
Depreciation expense for the years ended December 31, 2016, 2015 and 2014 was $601, $568 and $681, respectively.