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Property and Equipment
 12 Months Ended
Dec. 31, 2017
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)
 
2017
 
2016
Manufacturing equipment
5
 
$
8,395

 
$
6,445

Lease and loaner instruments
1 - 5
 
4,106

 
3,581

Prototype instruments
2
 
2,938

 
2,975

Computer equipment
3
 
2,067

 
1,592

Furniture and fixtures
5
 
1,670

 
1,642

Leasehold improvements
Various
 
11,971

 
8,878

Construction in progress
 
 
158

 
1,861

Total property and equipment, gross
 
 
31,305


26,974

Less: Accumulated depreciation and amortization
 
 
(17,248
)
 
(14,816
)
Total property and equipment, net
 
 
$
14,057


$
12,158


Prototype instruments consist of nCounter instruments used in internal testing and other development activities. Accumulated depreciation on lease and loaner instruments was $1.9 million and $1.5 million at December 31, 2017 and 2016, respectively.
Depreciation and amortization expense related to property and equipment for the years ended December 31, 2017, 2016 and 2015 totaled approximately $3.3 million, $2.9 million and $2.3 million, respectively.