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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, net consists of the following (in thousands) at:
 
June 30,
 
December 31,
 
2020
 
2019
Research and development equipment
$
1,296

 
$
1,086

Computer hardware and software
1,721

 
1,418

Tools and molds
1,596

 
1,303

Leasehold improvements
3,513

 
1,500

Furniture and fixtures
1,192

 
624

Construction in progress
53

 
176

 
9,371

 
6,107

Less: accumulated depreciation and amortization
(3,809
)
 
(3,060
)
 
$
5,562

 
$
3,047


Depreciation and amortization expense of property and equipment was $0.3 million and $0.7 million for the three and six months ended June 30, 2020, respectively. Depreciation and amortization expense of property and equipment was $0.3 million and $0.5 million for the three and six months ended June 30, 2019, respectively.