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Property and Equipment, net
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property and Equipment, net
4.
 
Property and Equipment, net
Property and equipment, net, consists of the following:
 
 
 
December 31,
 
(in thousands)
 
2018
 
 
2017
 
Office and computer equipment
 
$
1,249
 
 
$
1,215
 
Software
 
 
1,030
 
 
 
913
 
Leasehold improvements
 
 
1,839
 
 
 
1,553
 
Research and development equipment
 
 
1,182
 
 
 
1,161
 
 
 
 
5,300
 
 
 
4,842
 
Less: accumulated depreciation
 
 
(4,203
)
 
 
(3,631
)
Property and equipment, net
 
$
1,097
 
 
$
1,211
 
Depreciation charged to the statement of operations for the years ended December
 31, 2018, 2017, and 2016 was $573 thousand, $369 thousand and $290 thousand, respectively.