Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2012

Accounting Policies [Abstract]

Concentrations of Credit Risk

Significant customers accounted for the following percentages of total revenues:

	Three Months Ended June 30,		Six Months Ended June 30,
	2012	2011	2012	2011
Customer A	26%	24%	24%	25%
Customer B	9%	8%	10%	8%
Customer C	8%	12%	9%	13%

Amounts due from these significant customers were:

	June 30,		December 31,
	2012		2011
Customer A	$	11,438	$	7,354
Customer B	3,259		1,511
Customer C	4,070		4,242

We believe significant customer amounts outstanding at June 30, 2012 and December 31, 2011 are collectible.