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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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- Definition 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. + References No definition available. + Details
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- Definition 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 -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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