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Segment Information and Foreign Operations, Revenue by product (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Revenue by product type [Abstract]        
Net revenue $ 20,521 $ 20,808 $ 66,732 $ 69,447
GaAs Substrates [Member]
       
Revenue by product type [Abstract]        
Net revenue 9,013 12,901 31,378 39,994
InP Substrates [Member]
       
Revenue by product type [Abstract]        
Net revenue 1,420 1,649 5,286 4,433
Ge Substrates [Member]
       
Revenue by product type [Abstract]        
Net revenue 5,472 2,007 13,370 7,078
Raw Materials And Other [Member]
       
Revenue by product type [Abstract]        
Net revenue $ 4,616 $ 4,251 $ 16,698 $ 17,942