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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2019
Segment Reporting [Abstract]  
Summary of Revenues on Percentage Basis by Geographic Region The following table summarizes revenues on a percentage basis by geographic region, based on the region in which the customer is located.

 

 

 

Three Months Ended March 31,

 

 

 

2019

 

 

2018

 

United States

 

 

52

%

 

 

67

%

South America

 

 

11

%

 

 

10

%

Japan

 

 

8

%

 

 

2

%

Europe

 

 

19

%

 

 

15

%

Other

 

 

10

%

 

 

6

%

 

 

 

100

%

 

 

100

%