Segment Information (Tables)

6 Months Ended

Jun. 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 June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
United States		66	%		72	%		67	%		66	%
South America		12	%		10	%		11	%		10	%
Japan		3	%		2	%		3	%		2	%
Europe		12	%		11	%		14	%		16	%
Other		7	%		5	%		5	%		6	%
		100	%		100	%		100	%		100	%