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Segment Information and Foreign Operations (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Segment Information [Abstract]          
Number of operating segments 1 1 1 1 1
Revenue by product type          
Net revenue $ 25,153 $ 30,031 $ 48,639 $ 54,597  
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Net revenue 25,153 30,031 48,639 54,597  
Long-lived assets by geographic region [Abstract]          
Long-lived assets 35,316   35,316   34,282 [1]
Revenue, Major Customer [Line Items]          
Number of customers representing significant revenue 1 1 1 1  
Number of major customers 5 5 5 5  
Number of customers who accounted for 10% or more share in trade accounts receivable 1   1    
Major Customer One [Member]
          
Revenue, Major Customer [Line Items]          
Percentage of revenue generated by major customers (in hundredths) 15.10% 19.00% 16.20% 17.60%  
Percentage of trade accounts receivable accounted by one customer (in hundredths) 32.20%   32.20%   32.40%
Top Five Major Customers [Member]
          
Revenue, Major Customer [Line Items]          
Percentage of revenue generated by major customers (in hundredths) 39.30% 36.90% 39.10% 36.50%  
North America [Member]
          
Revenue by product type          
Net revenue 4,266 [2] 6,412 [2] 9,433 [2] 10,204 [2]  
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Net revenue 4,266 [2] 6,412 [2] 9,433 [2] 10,204 [2]  
Long-lived assets by geographic region [Abstract]          
Long-lived assets 375   375   484
Europe [Member]
          
Revenue by product type          
Net revenue 4,806 6,048 9,371 11,232  
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Net revenue 4,806 6,048 9,371 11,232  
Japan [Member]
          
Revenue by product type          
Net revenue 2,603 4,379 4,792 7,407  
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Net revenue 2,603 4,379 4,792 7,407  
Taiwan [Member]
          
Revenue by product type          
Net revenue 3,594 2,745 5,640 5,609  
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Net revenue 3,594 2,745 5,640 5,609  
Asia Pacific [Member]
          
Revenue by product type          
Net revenue 9,884 10,447 19,403 20,145  
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Net revenue 9,884 10,447 19,403 20,145  
China [Member]
          
Long-lived assets by geographic region [Abstract]          
Long-lived assets 34,941   34,941   33,798
GaAs Substrates [Member]
          
Revenue by product type          
Net revenue 14,862 17,966 27,093 33,858  
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Net revenue 14,862 17,966 27,093 33,858  
InP Substrates [Member]
          
Revenue by product type          
Net revenue 1,333 1,604 2,784 2,936  
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Net revenue 1,333 1,604 2,784 2,936  
Ge Substrates [Member]
          
Revenue by product type          
Net revenue 2,441 2,701 5,071 5,691  
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Net revenue 2,441 2,701 5,071 5,691  
Raw Materials And Other [Member]
          
Revenue by product type          
Net revenue 6,517 7,760 13,691 12,112  
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Net revenue $ 6,517 $ 7,760 $ 13,691 $ 12,112  
[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