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Information About Geographic Areas
 9 Months Ended
Sep. 30, 2020
Segment Reporting [Abstract]  
Information About Geographic Areas Information About Geographic Areas
We operate in one reporting segment that develops, manufacturers and commercializes tools for life sciences research. Our chief executive officer manages our operations and evaluates our financial performance on a consolidated basis. For purposes of allocating resources and evaluating regional financial performance, our chief executive officer reviews separate sales information for the different regions of the world. Our general and administrative expenses and our research and development expenses are not allocated to any specific region. Most of our principal operations, other than manufacturing, and our decision-making functions are located at our corporate headquarters in the United States.
A summary table of our total revenue by geographic areas of our customers and by product and services for the three and nine months ended September 30, 2020 and 2019 is included in Note 5 to the condensed consolidated financial statements.
Sales to customers in the United States represented $23.3 million, or 58% of total revenues, and $50.7 million, or 54% of total revenues, for the three and nine months ended September 30, 2020, respectively. Sales to customers in the United States represented $10.5 million, or 40% of total revenues, and $32.9 million, or 39% of total revenues, for the three and nine months ended September 30, 2019, respectively.
No foreign country or jurisdiction had sales in excess of 10% of total revenues for the three months ended September 30, 2020 and 2019, except for China, which had total revenues of $3.9 million, or 15% of total revenues for the three months ended September 30, 2019. There was no foreign country or jurisdiction with sales in excess of 10% of our total revenues for the nine months ended September 30, 2020 or 2019, except for China, which had sales of $11.4 million, or 13% of total revenues, for the nine months ended September 30, 2019.