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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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