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Segment and Geographic Data (Tables)
 6 Months Ended
Jun. 30, 2020
Segment Reporting [Abstract]  
Schedule of revenue by geographic information
Geographic information consisted of the following (in thousands):
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2020
 
2019
 
2020
 
2019
Product revenue
 
 

 
 

 
 

 
 

United States
 
$
8,331

 
$
17,194

 
$
22,159

 
$
34,793

Germany
 
1,346

 
1,673

 
3,316

 
4,137

Rest of world
 
66

 
470

 
558

 
876

 
 
$
9,743

 
$
19,337

 
$
26,033

 
$
39,806
Schedule of property, plant and equipment by geographic information
 
 
June 30, 2020
 
December 31, 2019
Property and equipment, net
 
 

 
 

United States
 
$
13,709

 
$
13,303

Germany
 
46

 
53

 
 
$
13,755

 
$
13,356