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Segment Information and Foreign Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Segment	Jun. 30, 2012	Dec. 31, 2012
Segment Information [Abstract]
Number of operating segments			1
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Net revenue	$ 23,831	$ 25,153	$ 46,211	$ 48,639
Long-lived assets by geographic region [Abstract]
Long-lived assets	37,301		37,301		37,235	[1]
Major Customer One [Member]
Revenue, Major Customer [Line Items]
Number of customers representing significant revenue	0	1	0	1
Percentage of revenue generated by major customers (in hundredths)		15.00%		16.00%
Number of customers who accounted for 10% or more share in trade accounts receivable	2		2		1
Percentage of trade accounts receivable accounted by one customer (in hundredths)	12.00%		12.00%		28.00%
Top Five Major Customers [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue generated by major customers (in hundredths)	32.00%	39.00%	30.00%	39.00%
Number of major customers			5	5
China [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Net revenue	7,704	6,195	13,733	11,969
Long-lived assets by geographic region [Abstract]
Long-lived assets	36,989		36,989		36,805
Europe (primarily Germany) [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Net revenue	5,622	4,806	10,311	9,371
Taiwan [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Net revenue	3,159	3,594	6,938	5,640
North America (primarily the United States) [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Net revenue	2,043	4,266	5,512	9,433
Long-lived assets by geographic region [Abstract]
Long-lived assets	312		312		430
Japan [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Net revenue	3,020	2,603	5,302	4,792
Asia Pacific (excluding Japan and Taiwan) [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Net revenue	$ 2,283	$ 3,689	$ 4,415	$ 7,434
[1] The condensed consolidated balance sheet at December 31, 2012 has been derived from the audited consolidated financial statements at that date.

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Number of customers who represented significant revenue of the entity during the reporting period.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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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.

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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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