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Segment Information
3 Months Ended
Mar. 31, 2019
Segment Information [Abstract]  
Segment Information

7.    Segment Information

We have one operating segment with operations primarily in the United States and Canada. Sales are assigned to geographic locations based on the location of customers. Sales by geographic location are as follows (in thousands):







 

 

 

 

 

 



 

Three months ended March 31,



 

2019

 

2018

Revenue:

 

 

 

 

 

 

United States

 

$

2,234 

 

$

2,237 

Canada

 

 

565 

 

 

583 

Other countries

 

 

25 

 

 

17 

Total revenue

 

$

2,824 

 

$

2,837 



During each of the three months ended March 31, 2019 and 2018,  three and two of our customers represented an aggregate of approximately 36% and 45%, of our revenue, respectively.