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Property and Equipment
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property and Equipment Property and Equipment
Property and equipment consists of the following (dollars in thousands):
 December 31,
2020
December 31,
2019
Lab equipment and furniture$12,526 $11,053 
Leasehold improvements15,183 14,217 
Software2,295 2,225 
Finance lease assets (1)
22,747 — 
Computer equipment2,113 1,839 
Construction-in-progress— 433 
54,864 29,767 
Less accumulated depreciation and amortization(17,040)(12,699)
Total$37,824 $17,068 

(1) Refer to Note 10, Leases.
Depreciation and amortization expense on property and equipment was approximately $4.3 million, $1.5 million, and $1.9 million for the years ended December 31, 2020, 2019 and 2018, respectively.
As of December 31, 2020, there were no identified indicators of impairment.