Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Summary of revenue by geographic region
Revenue	$ 8,307	$ 10,207
Australia [Member]
Summary of revenue by geographic region
Revenue	5,406	1,116
China [Member]
Summary of revenue by geographic region
Revenue	959	851
United States [Member]
Summary of revenue by geographic region
Revenue	915	2,125
Korea [Member]
Summary of revenue by geographic region
Revenue	570
Taiwan [Member]
Summary of revenue by geographic region
Revenue	39	1,693
France [Member]
Summary of revenue by geographic region
Revenue	28	2,751
Other [Member]
Summary of revenue by geographic region
Revenue	$ 390	$ 1,671