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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
Property and equipment
Property and equipment consist of the following as of December 31, 2014 and 2013 (in thousands):
 
December 31,
 
2014
 
2013
Leasehold improvements
$
2,559

 
$
2,320

Lab and clean room equipment
3,040

 
2,025

Furniture and equipment
2,398

 
1,241

Construction in Progress
949

 
802

Property and equipment, gross
8,946

 
6,388

Less accumulated depreciation
(3,499
)
 
(2,302
)
Property and equipment, net
$
5,447

 
$
4,086