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Segment Information and Foreign Operations - Product Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenue by product type                      
Revenue $ 20,269 $ 21,872 $ 20,495 $ 18,713 $ 18,057 $ 18,371 $ 21,010 $ 20,064 $ 81,349 $ 77,502 $ 83,499
Substrates                      
Revenue by product type                      
Revenue                 65,633 58,220 60,178
Raw Materials And Others                      
Revenue by product type                      
Revenue                 $ 15,716 $ 19,282 $ 23,321