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Segment Information and Foreign Operations (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Segment
Jun. 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]          
Net revenue $ 21,449 $ 23,831 $ 40,794 $ 46,211  
Long-lived assets by geographic region [Abstract]          
Long-lived assets 35,226   35,226   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) 36.00% 32.00% 35.00% 30.00%  
Number of major customers 5 5 5 5  
Europe (primarily Germany) [Member]
         
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Net revenue 4,968 5,622 11,551 10,311  
China [Member]
         
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Net revenue 4,960 7,704 9,125 13,733  
Long-lived assets by geographic region [Abstract]          
Long-lived assets 34,955   34,955   37,417
Asia Pacific (excluding China, Japan and Taiwan) [Member]
         
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Net revenue 2,450 2,283 4,839 4,415  
Taiwan [Member]
         
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Net revenue 2,785 3,159 4,900 6,938  
Japan [Member]
         
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Net revenue 3,457 3,020 5,770 5,302  
North America (primarily the United States) [Member]
         
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Net revenue 2,829 2,043 4,609 5,512  
Long-lived assets by geographic region [Abstract]          
Long-lived assets $ 271   $ 271   $ 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