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Property and Equipment, Net (Tables)
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Property and Equipment, Net
Property and equipment, net consisted of the following (in thousands):

 
 
December 31,
 
 
2019
 
2018
Lab equipment
 
$
18,214

 
$
10,771

Office equipment
 
2,211

 
1,610

Furniture and fixtures
 
1,301

 
599

Leasehold improvements
 
10,316

 
2,076

Assets under construction
 
4,687

 
8,620

Less: accumulated depreciation
 
(8,565
)
 
(3,708
)
Total property and equipment, net
 
$
28,164

 
$
19,968