Segment Information

3 Months Ended

Mar. 31, 2020

6. 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,
	2020		2019
Revenue:
United States	$	2,151	$	2,234
Canada		624		565
Other countries		17		25
Total revenue	$	2,792	$	2,824

During each of the three months ended March 31, 2020 and 2019, one and three of our customers represented an aggregate of approximately 22% and 36% of our revenue, respectively.