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Segment Information and Foreign Operations (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Segment
Sep. 30, 2012
Dec. 31, 2012
Segment Information [Abstract]          
Number of operating segments     1    
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Net revenue $ 20,521 $ 20,808 $ 66,732 $ 69,447  
Long-lived assets by geographic region [Abstract]          
Long-lived assets 37,450   37,450   37,235 [1]
Major Customer One [Member]
         
Revenue, Major Customer [Line Items]          
Number of customers representing significant revenue 0 1 0 1  
Percentage of revenue generated by major customers (in hundredths)   14.30%   15.60%  
Number of customers who accounted for 10% or more share in trade accounts receivable 2   2   1
Percentage of trade accounts receivable accounted by one customer (in hundredths) 11.00%   11.00%   28.00%
Top Five Major Customers [Member]
         
Revenue, Major Customer [Line Items]          
Percentage of revenue generated by major customers (in hundredths) 36.80% 37.30% 30.90% 37.00%  
Number of major customers     5 5  
China [Member]
         
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Net revenue 6,611 3,063 20,344 15,031  
Long-lived assets by geographic region [Abstract]          
Long-lived assets 37,222   37,222   36,805
Europe (primarily Germany) [Member]
         
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Net revenue 5,732 5,148 16,043 14,519  
Taiwan [Member]
         
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Net revenue 1,536 3,490 8,474 9,130  
North America (primarily the United States) [Member]
         
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Net revenue 2,298 3,230 7,810 12,663  
Long-lived assets by geographic region [Abstract]          
Long-lived assets 228   228   430
Japan [Member]
         
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Net revenue 1,931 2,404 7,233 7,196  
Asia Pacific (excluding Japan and Taiwan) [Member]
         
Net revenues reported for products shipped to customers in corresponding geographic region [Abstract]          
Net revenue $ 2,413 $ 3,473 $ 6,828 $ 10,908  
[1] The condensed consolidated balance sheet at December 31, 2012 has been derived from the audited consolidated financial statements at that date.