Summary of Significant Accounting Policies (Details 4) (Maximum)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Maximum
Revenue Recognition
Adjustments as percentage of net revenue	0.50%	0.50%	0.50%	0.50%