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Segment Information and Foreign Operations (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 USD ($) Customer | Jun. 30, 2014 USD ($) Customer | Jun. 30, 2015 USD ($) Segment Customer | Jun. 30, 2014 USD ($) Customer | Dec. 31, 2014 USD ($) Customer
Segment Information [Abstract] |  |  |  |  |
Number of operating segments | Segment |  |  | 1 |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |
Revenue | $ 21,010 | $ 21,449 | $ 41,074 | $ 40,794 |
Long-lived assets by geographic region [Abstract] |  |  |  |  |
Long-lived assets | $ 33,366 |  | $ 33,366 |  | $ 33,862
Revenue [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Number of customers representing significant share | Customer | 1 | 0 | 0 | 0 |
Percentage share generated by major customers (in hundredths) | 10.00% | 10.00% | 10.00% | 10.00% |
Accounts Receivable [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Number of customers representing significant share | Customer | 2 |  |  |  | 2
Major Customer One [Member] | Accounts Receivable [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Percentage share generated by major customers (in hundredths) |  |  | 11.00% |  | 10.00%
Major Customer Two [Member] | Accounts Receivable [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Percentage share generated by major customers (in hundredths) |  |  | 11.00% |  | 10.00%
Top Five Major Customers [Member] | Revenue [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Number of customers representing significant share | Customer | 5 | 5 | 5 | 5 |
Percentage share generated by major customers (in hundredths) | 37.00% | 37.00% | 36.00% | 35.00% |
Reportable Geographical Components [Member] | Europe (primarily Germany) [Member] |  |  |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |
Revenue | $ 5,664 | $ 4,968 | $ 10,607 | $ 11,551 |
Reportable Geographical Components [Member] | China [Member] |  |  |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |
Revenue | 3,561 | 4,960 | 6,858 | 9,125 |
Long-lived assets by geographic region [Abstract] |  |  |  |  |
Long-lived assets | 32,252 |  | 32,252 |  | $ 33,726
Reportable Geographical Components [Member] | Taiwan [Member] |  |  |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |
Revenue | 3,414 | 2,785 | 6,523 | 4,900 |
Reportable Geographical Components [Member] | North America (primarily the United States) [Member] |  |  |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |
Revenue | 2,850 | 2,829 | 6,322 | 4,609 |
Long-lived assets by geographic region [Abstract] |  |  |  |  |
Long-lived assets | 1,114 |  | 1,114 |  | $ 136
Reportable Geographical Components [Member] | Asia Pacific (excluding China, Japan and Taiwan) [Member] |  |  |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |
Revenue | 2,768 | 2,450 | 5,527 | 4,839 |
Reportable Geographical Components [Member] | Japan [Member] |  |  |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |
Revenue | $ 2,753 | $ 3,457 | $ 5,237 | $ 5,770 |

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