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Segments and Major Customers (Details 3) - 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
Major Customer Disclosure                      
Revenue $ 97,559 $ 89,855 $ 76,501 $ 72,682 $ 76,773 $ 73,779 $ 72,812 $ 72,914 $ 336,597 $ 296,278 $ 296,558
Property, plant and equipment, net 58,442       56,616       58,442 56,616  
South Korea                      
Major Customer Disclosure                      
Revenue                 129,542 115,486 107,441
USA                      
Major Customer Disclosure                      
Revenue                 121,209 118,278 109,060
Property, plant and equipment, net 55,000       55,200       55,000 55,200  
Japan                      
Major Customer Disclosure                      
Revenue                 30,215 29,687 30,454
Europe                      
Major Customer Disclosure                      
Revenue                 16,031 9,616 21,349
Canada                      
Major Customer Disclosure                      
Revenue                 3,478 214 7,119
SINGAPORE                      
Major Customer Disclosure                      
Revenue                 17,908 16,312 12,980
Asia-Other                      
Major Customer Disclosure                      
Revenue                 18,214 6,685 $ 8,155
India                      
Major Customer Disclosure                      
Property, plant and equipment, net 1,300       1,300       1,300 1,300  
Other foreign locations                      
Major Customer Disclosure                      
Property, plant and equipment, net $ 2,100       $ 100       $ 2,100 $ 100