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Property and Equipment
 3 Months Ended
Mar. 31, 2018
Property, Plant and Equipment [Abstract]  
Property and Equipment
Property and Equipment
Property and equipment, net, consisted of:
 
March 31,
2018
 
December 31,
2017
Computer equipment and software
$
502

 
$
307

Furniture and fixtures
270

 
89

Machinery and equipment
2,649

 
2,495

Leasehold improvements
43

 
28

Construction in process
143

 
—

 
3,607

 
2,919

Less: accumulated depreciation
(505
)
 
(355
)
 
$
3,102

 
$
2,564


Depreciation expense was $156 and $32 for the three months ended March 31, 2018 and 2017, respectively.