Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of revenue by geographic region
Revenue	$ 20,091	$ 19,942	$ 17,003	$ 10,207	$ 19,365	$ 33,637	$ 43,028	$ 37,970	$ 67,243	$ 134,000	$ 77,362
Korea [Member]
Summary of revenue by geographic region
Revenue									19,862	51,461	25,605
Australia [Member]
Summary of revenue by geographic region
Revenue									12,494	14	2
United States [Member]
Summary of revenue by geographic region
Revenue									11,104	12,253	6,520
France [Member]
Summary of revenue by geographic region
Revenue									8,482	359	69
Taiwan [Member]
Summary of revenue by geographic region
Revenue									5,663	50,006	31,914
China [Member]
Summary of revenue by geographic region
Revenue									3,839	3,877	1,084
Japan [Member]
Summary of revenue by geographic region
Revenue									2,999	11,362	10,745
Other [Member]
Summary of revenue by geographic region
Revenue									$ 2,800	$ 4,668	$ 1,423