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Property and Equipment
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property and Equipment
Property and Equipment    
Property and equipment consisted of the following at December 31 (in thousands):
 
Useful Life
(Years)
 
2018
 
2017
Manufacturing equipment
5
 
$
10,625

 
$
8,395

Lease and loaner instruments
1 - 5
 
4,305

 
4,106

Prototype instruments
2
 
975

 
2,938

Computer equipment
3
 
2,095

 
2,067

Furniture and fixtures
5
 
1,456

 
1,670

Leasehold improvements
Various
 
11,960

 
11,971

Construction in progress
 
 
685

 
158

Total property and equipment, gross
 
 
32,101


31,305

Less: Accumulated depreciation and amortization
 
 
(16,930
)
 
(17,248
)
Total property and equipment, net
 
 
$
15,171


$
14,057


Prototype instruments consist of nCounter instruments used in internal testing and other development activities. Accumulated depreciation on lease and loaner instruments was $2.4 million and $1.9 million at December 31, 2018 and 2017, respectively.
Depreciation and amortization expense related to property and equipment for the years ended December 31, 2018, 2017, and 2016 totaled approximately $4.0 million, $3.3 million, and $2.9 million, respectively.