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Segment Information and Foreign Operations, Revenue by product (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Revenue by product type [Abstract]        
Net revenue $ 21,449 $ 23,831 $ 40,794 $ 46,211
GaAs Substrates [Member]
       
Revenue by product type [Abstract]        
Net revenue 11,364 10,642 19,852 22,365
InP Substrates [Member]
       
Revenue by product type [Abstract]        
Net revenue 3,000 2,017 5,180 3,866
Ge Substrates [Member]
       
Revenue by product type [Abstract]        
Net revenue 1,681 5,347 4,959 7,898
Raw Materials And Other [Member]
       
Revenue by product type [Abstract]        
Net revenue $ 5,404 $ 5,825 $ 10,803 $ 12,082