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SEGMENT INFORMATION
 9 Months Ended
Sep. 30, 2021
Segment Reporting [Abstract]  
SEGMENT INFORMATION SEGMENT INFORMATIONManagement determined that the Company functions as a single operating segment, and thus reports as a single reportable segment. This operating segment is focused on the development and global commercialization of clinical laboratory services allowing healthcare providers and patients to make individualized treatment decisions. Management assessed the discrete financial information routinely reviewed by the Company's Chief Operating Decision Maker, its President and Chief Executive Officer, to monitor the Company's operating performance and support decisions regarding allocation of resources to its operations. Performance is continuously monitored at the consolidated level to timely identify deviations from expected results.
The following table summarizes total revenue from customers by geographic region. Product revenues are attributed to countries based on ship-to location.
Three Months Ended September 30,Nine Months Ended September 30,
(In thousands)2021202020212020
United States$429,150 $392,120 $1,213,142 $968,825 
Outside of United States27,229 16,243 80,133 56,227 
Total revenues$456,379 $408,363 $1,293,275 $1,025,052 
Long-lived assets located in countries outside of the United States are not significant.