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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property and Equipment
Property and equipment are composed of the following as of December 31, 2018 and 2017 (in thousands):
 
2018
 
2017
Furniture and office equipment
$
4,445

 
$
4,552

Leasehold improvements
5,168

 
5,168

Lab equipment
63

 
209

 
9,676

 
9,929

Less: accumulated depreciation and amortization
(7,883
)
 
(7,564
)
Property and equipment, net
$
1,793

 
$
2,365