CONCENTRATION OF RISK, Revenues by Geographic Area (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenues by geographic area [Line Items]
Total revenue	$ 29,987,000	$ 11,252,000	$ 42,607,000	$ 20,853,000
South Korea [Member]
Revenues by geographic area [Line Items]
Total revenue	23,560,000	6,921,000	30,953,000	13,075,000
Japan [Member]
Revenues by geographic area [Line Items]
Total revenue	4,137,000	2,595,000	6,703,000	3,711,000
Taiwan [Member]
Revenues by geographic area [Line Items]
Total revenue	732,000	251,000	1,989,000	538,000
Other foreign locations [Member]
Revenues by geographic area [Line Items]
Total revenue	$ 274,000	$ 40,000	$ 404,000	$ 82,000