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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Property and Equipment
Property and equipment consisted of the following at December 31 (in thousands):
 
Useful Life
(Years)
 
2019
 
2018
Manufacturing equipment
5
 
$
12,292

 
$
10,625

Prototype instruments
2
 
2,202

 
975

Computer equipment
3
 
2,779

 
2,095

Furniture and fixtures
5
 
1,565

 
1,456

Leasehold improvements
Various
 
12,005

 
11,960

Lease and loaner instruments
1 - 5
 
—

 
4,305

Construction in progress
 
 
7,592

 
685

Total property and equipment, gross
 
 
38,435


32,101

Less: Accumulated depreciation and amortization
 
 
(18,251
)
 
(16,930
)
Total property and equipment, net
 
 
$
20,184


$
15,171