Segment Information (Tables)

9 Months Ended

Sep. 30, 2018

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.

	Quarters Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
United States		58	%		71	%		64	%		68	%
South America		9	%		8	%		10	%		9	%
Japan		7	%		2	%		4	%		2	%
Europe		18	%		14	%		15	%		15	%
Other		8	%		5	%		7	%		6	%
		100	%		100	%		100	%		100	%