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Information About Geographic Areas
 3 Months Ended
Mar. 31, 2022
Segment Reporting [Abstract]  
Information About Geographic Areas Information About Geographic Areas
We operate in one reporting segment that develops, manufactures and commercializes tools for life science 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 revenue by geographic areas of our customers and by product and services for the three months ended March 31, 2022 and 2021 is included in Note 6 to the condensed consolidated financial statements.
Revenue from customers in the United States represented $11.8 million, or 45% of total revenues, and $18.1 million, or 55% of total revenues, for the three months ended March 31, 2022 and 2021, respectively.
Revenue from customers in China represented $2.8 million, or 11% of total revenues, and $3.0 million, or 9% of total revenues, for the three months ended March 31, 2022 and 2021, respectively. With the exception of China for the three months ended March 31, 2022, no foreign country had revenue in excess of 10% of total revenues during any of the periods presented in this report.