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Segment Information
12 Months Ended
Dec. 31, 2019
Segment Information  
Segment Information

4. Segment Information

The Company operates in a single segment, which is the discovery (research), development and commercialization of human therapeutics. The following table summarizes total revenue by geographic region:

Year Ended December 31, 

(In thousands)

    

2019

    

2018

    

2017

US

$

54,760

$

49,239

$

14,272

Europe

 

18,654

11,117

 

1,109

Asia

14

5

Total revenue

$

73,414

$

60,370

$

15,386

The following table summarizes total revenue from each of the Company’s customers or collaboration partners who individually accounted for 10% or more of the Company’s total revenue (as a percentage of total revenues) during the most recent three years:

Year Ended December 31, 

(% of total revenue)

    

2019

    

2018

    

2017

Mylan

44

%  

Janssen

42

%  

51

%  

Pfizer

14

%  

Alfasigma

18

%  

Cardinal Health

28

%  

AmerisourceBergen

25

%  

McKesson

23

%  

Besse Medical

13

%