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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Property and equipment
Property and equipment consist of the following as of December 31, 2015 and 2014 (in thousands):
 
December 31,
 
2015
 
2014
Leasehold improvements
$
2,684

 
$
2,559

Lab and clean room equipment
4,564

 
3,040

Furniture and equipment
4,577

 
2,398

Construction in Progress
2,629

 
949

Property and equipment, gross
14,454

 
8,946

Less accumulated depreciation
(4,979
)
 
(3,499
)
Property and equipment, net
$
9,475

 
$
5,447