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PROPERTY AND EQUIPMENT, NET
12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
PROPERTY AND EQUIPMENT, NET
PROPERTY AND EQUIPMENT, NET

Property and equipment, net consisted of the following:
 
December 31,
 
2017
 
2016
Land
$
1,435

 
$
1,435

Building and building improvements
1,053

 
1,053

Computer equipment and software
970

 
1,509

Office and other equipment
614

 
430

Instruments
10,666

 
8,228

Sample inventory
1,619

 
1,488

Construction in progress
1,977

 
1,666

 
18,334

 
15,809

Less: accumulated depreciation
(7,943
)
 
(7,217
)
Total property and equipment, net
$
10,391

 
$
8,592



Depreciation expense is included in general and administrative expenses and was $2,159, $1,867 and $1,848 for the years ended December 31, 2017, 2016 and 2015, respectively.