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Property and Equipment
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Property and Equipment Property and Equipment
Property and equipment consist of the following (dollars in thousands):
 
December 31,
2019
 
December 31,
2018
Lab equipment and furniture
$
11,053

 
$
8,995

Leasehold improvements
14,217

 
2,731

Software
2,225

 
2,181

Computer equipment
1,839

 
1,313

Construction-in-progress
433

 
94

 
29,767

 
15,314

Less accumulated depreciation and amortization
(12,699
)
 
(11,219
)
Total
$
17,068

 
$
4,095


Depreciation and amortization expense on property and equipment was approximately $1.5 million, $1.9 million, and $1.2 million for the years ended December 31, 2019, 2018 and 2017, respectively.
The Company annually performs an impairment assessment of its property and equipment in the fourth quarter of each year, or earlier if impairment indicators exist. As of December 31, 2019, there were no identified indicators of impairment.