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Segment Information and Foreign Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Segment	Sep. 30, 2013	Dec. 31, 2013
Segment Information [Abstract]
Number of operating segments			1
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Revenue	$ 23,138	$ 20,521	$ 63,932	$ 66,732
Long-lived assets by geographic region [Abstract]
Long-lived assets	34,663		34,663		37,621	[1]
Major Customer One [Member]
Revenue, Major Customer [Line Items]
Number of customers representing significant revenue	0	0	0	0
Number of customers who accounted for 10% or more share in trade accounts receivable	1		1		1
Percentage of trade accounts receivable accounted by one customer (in hundredths)					20.00%
Top Five Major Customers [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue generated by major customers (in hundredths)	35.00%	37.00%	35.00%	31.00%
Number of major customers	5	5	5	5
Europe (primarily Germany) [Member] | Reportable Geographical Components [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Revenue	5,429	5,732	16,980	16,043
China [Member] | Reportable Geographical Components [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Revenue	4,298	6,611	13,423	20,344
Long-lived assets by geographic region [Abstract]
Long-lived assets	34,408		34,408		37,417
Taiwan [Member] | Reportable Geographical Components [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Revenue	3,835	1,536	8,735	8,474
Japan [Member] | Reportable Geographical Components [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Revenue	3,511	1,931	9,281	7,233
Asia Pacific (excluding China, Japan and Taiwan) [Member] | Reportable Geographical Components [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Revenue	3,537	2,413	8,376	6,828
North America (primarily the United States) [Member] | Reportable Geographical Components [Member]
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]
Revenue	2,528	2,298	7,137	7,810
Long-lived assets by geographic region [Abstract]
Long-lived assets	$ 255		$ 255		$ 204
[1] Derived from the audited consolidated financial statements included in the Annual Report on Form 10-K filed with the SEC for the year ended December 31, 2013.

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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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