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Segment, Product and Geographic Information (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, plant and equipment, net	$ 52,609	$ 57,150
Taiwan [Member]
Property, plant and equipment, net	51,519	56,185
China [Member]
Property, plant and equipment, net	744	822
U.S. [Member]
Property, plant and equipment, net	330	132
Korea [Member]
Property, plant and equipment, net	$ 16	$ 11

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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