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Property and Equipment (Tables)
 6 Months Ended
Jun. 30, 2019
Property, Plant and Equipment [Abstract]  
Schedule of property and equipment
Property and equipment consists of the following, in thousands of dollars:
 
June 30,
2019
 
December 31,
2018
 
(unaudited)
 
 
Lab equipment and furniture
$
9,133

 
$
8,995

Leasehold improvements
3,163

 
2,731

Software
2,212

 
2,181

Computer equipment
1,289

 
1,313

Construction-in-progress
193

 
94

 
15,990

 
15,314

Less accumulated depreciation and amortization
(11,962
)
 
(11,219
)
Total
$
4,028

 
$
4,095