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Fixed assets
12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Fixed assets Fixed assets
Fixed assets, net were as follows at December 31, 2019 and 2018:
 
 
December 31,
 
 
2019
 
2018
Leasehold improvements
 
$
5,039

 
$
2,384

Computer equipment and software
 
8,069

 
4,609

Furniture, fixtures, machinery and lab equipment
 
17,033

 
9,965

Assets in process
 
3,232

 
3,219

 
 
33,373

 
20,177

Less accumulated depreciation and amortization
 
(11,824
)
 
(7,483
)
Total
 
$
21,549

 
$
12,694


Depreciation expense was approximately $4.7 million, $2.6 million, and $2.3 million for the years ended December 31, 2019, 2018, and 2017, respectively.