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SEGMENT INFORMATION
 9 Months Ended
Sep. 30, 2020
Segment Reporting [Abstract]  
SEGMENT INFORMATION SEGMENT INFORMATION
Management 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)2020201920202019
United States$392,120 $218,805 $968,825 $580,718 
Outside of United States16,243 — 56,227 — 
Total revenues$408,363 $218,805 $1,025,052 $580,718 
Long-lived assets located in countries outside of the United States are not significant.