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Segment Reporting
 3 Months Ended
Mar. 31, 2021
Segment Reporting [Abstract]  
Segment Reporting SEGMENT REPORTING
Operating segments are defined as components of an enterprise for which separate financial information is available that is evaluated regularly by the Company’s Chief Operating Decision Maker (“CODM”), or decision making group, whose function is to allocate resources to and assess the performance of the operating segments.  The Company has identified its Chief Executive Officer as the CODM. In determining its reportable segments, the Company considered the markets and types of customers served and the products or services provided in those markets. The Company operates in a single reportable segment.
Revenues by geographic regions are based upon the customers’ ship-to address for product revenue and the region of testing for testing services revenue. The following table summarizes reportable revenues by geographic regions (in thousands):

Three Months Ended March 31,
20212020
Testing services revenue
United States$59,021 $31,329 
Rest of World260 113 
$59,281 $31,442 
Product revenue
United States$2,495 $2,061 
Europe2,252 2,002 
Rest of World1,031 632 
$5,778 $4,695 
Digital and other revenue
United States$2,288 $2,183 
Europe31 30 
Rest of World22 30 
$2,341 $2,243 
Total United States$63,804 $35,573 
Total Europe$2,283 $2,032 
Total Rest of World$1,313 $775 
Total$67,400 $38,380 
The following table summarizes long-lived assets, consisting of property and equipment, net, by geographic regions (in thousands):
March 31, 2021December 31, 2020
Long-lived assets:
United States$10,700 $9,888 
Europe302 351 
Rest of World396 465 
Total$11,398 $10,704