Segment and Geographic Information (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Summary of geographic information related to revenue
Total	100.00%	100.00%	100.00%	100.00%
China [Member]
Summary of geographic information related to revenue
Total	20.00%	61.00%	21.00%	79.00%
Japan [Member]
Summary of geographic information related to revenue
Total		2.00%		1.00%
Korea [Member]
Summary of geographic information related to revenue
Total	57.00%	37.00%	47.00%	20.00%
United States [Member]
Summary of geographic information related to revenue
Total	21.00%		31.00%
Other [Member]
Summary of geographic information related to revenue
Total	2.00%		1.00%