Significant Customers (Tables)

12 Months Ended

Dec. 31, 2012

Risks and Uncertainties [Abstract]

Schedules of Concentration of Risk, by Risk Factor

Sales to significant customers that represented more than 10 percent of total revenues are as follows:

	Year ended December 31,
	2012		2011
Customer A	17.5	%	19.2	%
Customer B	*		10.9	%
Total	17.5	%	30.1	%

The following table summarizes the percentage of total gross accounts receivable from significant customers:

	As of December 31,
	2012		2011
Customer A	20.3	%	25.0	%
Customer B	*		14.4	%
Total	20.3	%	39.4	%