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Segment Information and Foreign Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013 Segment	Dec. 31, 2012	Dec. 31, 2011
Segment Information [Abstract]
Number of operating segments									1
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Net revenue	$ 18,603	$ 20,521	$ 22,831	$ 22,380	$ 18,927	$ 20,808	$ 25,153	$ 23,486	$ 85,335	$ 88,374	$ 104,121
Long-lived assets by geographic region [Abstract]
Long-lived assets	37,621				37,235				37,621	37,235
North America [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Net revenue									10,665	15,391	20,471
Europe [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Net revenue									21,387	18,170	21,082
Japan [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Net revenue									9,041	9,346	13,749
Taiwan [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Net revenue									10,131	10,985	9,813
Asia Pacific (excluding Japan and Taiwan) [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Net revenue									9,165	14,667	13,825
China [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Net revenue									24,946	19,815	25,181
Long-lived assets by geographic region [Abstract]
Long-lived assets	37,417				36,805				37,417	36,805
United States of America [Member]
Long-lived assets by geographic region [Abstract]
Long-lived assets	$ 204				$ 430				$ 204	$ 430

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-SubTopic 10

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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