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Segment Information and Foreign Operations (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |
Number of operating segments |  |  |  |  | 1 |  |  |  |  |
Revenue by product type |  |  |  |  |  |  |  |  |  |
Net revenue | $ 20,808 |  | $ 28,305 |  | $ 69,447 |  | $ 82,902 |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |  |  |  |  |  |
Net revenue | 20,808 |  | 28,305 |  | 69,447 |  | 82,902 |  |  |
Long-lived assets by geographic region [Abstract] |  |  |  |  |  |  |  |  |  |
Long-lived assets | 36,201 |  |  |  | 36,201 |  |  |  | 34,282 | [1]
Major Customer One [Member] |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |
Number of customers representing significant revenue | 1 |  | 1 |  | 1 |  | 1 |  |  |
Percentage of revenue generated by major customers (in hundredths) | 14.30% |  | 21.30% |  | 15.60% |  | 18.90% |  |  |
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) | 18.30% |  |  |  | 18.30% |  |  |  | 32.40% |
Top Five Major Customers [Member] |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of revenue generated by major customers (in hundredths) | 37.30% |  | 39.40% |  | 37.00% |  | 37.20% |  |  |
Number of major customers | 5 |  | 5 |  | 5 |  | 5 |  |  |
North America [Member] |  |  |  |  |  |  |  |  |  |
Revenue by product type |  |  |  |  |  |  |  |  |  |
Net revenue | 3,230 | [2] | 6,049 | [2] | 12,663 | [2] | 16,253 | [2] |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |  |  |  |  |  |
Net revenue | 3,230 | [2] | 6,049 | [2] | 12,663 | [2] | 16,253 | [2] |  |
Long-lived assets by geographic region [Abstract] |  |  |  |  |  |  |  |  |  |
Long-lived assets | 350 |  |  |  | 350 |  |  |  | 484 |
Europe [Member] |  |  |  |  |  |  |  |  |  |
Revenue by product type |  |  |  |  |  |  |  |  |  |
Net revenue | 5,148 |  | 5,831 |  | 14,519 |  | 17,063 |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |  |  |  |  |  |
Net revenue | 5,148 |  | 5,831 |  | 14,519 |  | 17,063 |  |  |
Japan [Member] |  |  |  |  |  |  |  |  |  |
Revenue by product type |  |  |  |  |  |  |  |  |  |
Net revenue | 2,404 |  | 3,951 |  | 7,196 |  | 11,358 |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |  |  |  |  |  |
Net revenue | 2,404 |  | 3,951 |  | 7,196 |  | 11,358 |  |  |
Taiwan [Member] |  |  |  |  |  |  |  |  |  |
Revenue by product type |  |  |  |  |  |  |  |  |  |
Net revenue | 3,490 |  | 2,592 |  | 9,130 |  | 8,201 |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |  |  |  |  |  |
Net revenue | 3,490 |  | 2,592 |  | 9,130 |  | 8,201 |  |  |
Asia Pacific [Member] |  |  |  |  |  |  |  |  |  |
Revenue by product type |  |  |  |  |  |  |  |  |  |
Net revenue | 6,536 |  | 9,882 |  | 25,939 |  | 30,027 |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |  |  |  |  |  |
Net revenue | 6,536 |  | 9,882 |  | 25,939 |  | 30,027 |  |  |
China [Member] |  |  |  |  |  |  |  |  |  |
Long-lived assets by geographic region [Abstract] |  |  |  |  |  |  |  |  |  |
Long-lived assets | 35,851 |  |  |  | 35,851 |  |  |  | 33,798 |
GaAs Substrates [Member] |  |  |  |  |  |  |  |  |  |
Revenue by product type |  |  |  |  |  |  |  |  |  |
Net revenue | 12,901 |  | 18,735 |  | 39,994 |  | 52,593 |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |  |  |  |  |  |
Net revenue | 12,901 |  | 18,735 |  | 39,994 |  | 52,593 |  |  |
InP Substrates [Member] |  |  |  |  |  |  |  |  |  |
Revenue by product type |  |  |  |  |  |  |  |  |  |
Net revenue | 1,649 |  | 1,522 |  | 4,433 |  | 4,458 |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |  |  |  |  |  |
Net revenue | 1,649 |  | 1,522 |  | 4,433 |  | 4,458 |  |  |
Ge Substrates [Member] |  |  |  |  |  |  |  |  |  |
Revenue by product type |  |  |  |  |  |  |  |  |  |
Net revenue | 2,007 |  | 2,954 |  | 7,078 |  | 8,645 |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |  |  |  |  |  |
Net revenue | 2,007 |  | 2,954 |  | 7,078 |  | 8,645 |  |  |
Raw Materials And Other [Member] |  |  |  |  |  |  |  |  |  |
Revenue by product type |  |  |  |  |  |  |  |  |  |
Net revenue | 4,251 |  | 5,094 |  | 17,942 |  | 17,206 |  |  |
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract] |  |  |  |  |  |  |  |  |  |
Net revenue | $ 4,251 |  | $ 5,094 |  | $ 17,942 |  | $ 17,206 |  |  |
[1] | The Condensed Consolidated Balance Sheet at December 31, 2011 has been derived from the audited consolidated financial statements at that date.
[2] | Primarily the United States

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