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Property and Equipment
6 Months Ended
Jun. 30, 2020
Property, Plant and Equipment [Abstract]  
Property and Equipment Property and Equipment
Property and equipment consists of the following (dollars in thousands):
June 30,
2020
December 31,
2019
(unaudited)
Lab equipment and furniture$12,252  $11,053  
Leasehold improvements15,183  14,217  
Software2,225  2,225  
Computer equipment2,065  1,839  
Construction-in-progress15  433  
31,740  29,767  
Less accumulated depreciation and amortization(13,799) (12,699) 
Total$17,941  $17,068  
Depreciation and amortization expense on property and equipment was approximately $0.6 million and $1.1 million for the three and six months ended June 30, 2020, respectively, and approximately $0.4 million and $0.7 million for the three and six months ended June 30, 2019.

As of June 30, 2020, there were no identified indicators of impairment.