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Segment Reporting
 12 Months Ended
Dec. 31, 2021
Segment Reporting [Abstract]  
Segment Reporting Segment Reporting The Company's chief operating decision makers (the "CODM function"), which are the Company's Chief Executive Officer and Chief Operating Officer, utilize consolidated financial information to make decisions about allocating resources and assessing performance for the entire Company. The CODM function approves of key operating and strategic decisions, including key decisions in clinical development and clinical operating activities, entering into significant contracts, such as revenue contracts and collaboration agreements and approves the Company's consolidated operating budget. The CODM function views the Company's operations and manages its business as a single reportable operating segment. The Company's single operating segment covers the Company’s research and development activities, primarily comprising the CDI program and antibiotic pipeline research activities. As the Company operates in one operating segment, all required financial segment information can be found in the consolidated financial statements.
The Company operates in two geographic regions: the U.K. and the U.S. The following table summarizes the Company's long-lived assets, which include the Company's property and equipment, net and right-of-use assets by geography:

Year Ended December 31, 2021Year Ended December 31, 2020
United Kingdom$2,762 $1,228 
United States722 51 
$3,484 $1,279 

For details of revenue from external customers by geography refer to Note 7.