Segment Information (Tables)

12 Months Ended

Dec. 31, 2013

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 country in which the customer is located:

	Years ended December 31,
	2013			2012			2011
United States		84	%		82	%		83	%
Japan		8	%		15	%		16	%
Middle East		6	%		—			—
Other		2	%		3	%		1	%
		100	%		100	%		100	%