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Segments and Major Customers (Details 3) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Major Customer Disclosure                      
Revenue $ 76,773 $ 73,779 $ 72,812 $ 72,914 $ 72,040 $ 69,712 $ 76,518 $ 78,288 $ 296,278 $ 296,558 $ 271,501
Property, plant and equipment, net 56,616       64,023       56,616 64,023  
South Korea                      
Major Customer Disclosure                      
Revenue                 115,486 107,441 112,806
USA                      
Major Customer Disclosure                      
Revenue                 118,278 109,060 80,652
Property, plant and equipment, net 55,200       63,000       55,200 63,000  
Japan                      
Major Customer Disclosure                      
Revenue                 29,687 30,454 51,156
Europe                      
Major Customer Disclosure                      
Revenue                 9,616 21,349 15,985
Canada                      
Major Customer Disclosure                      
Revenue                 214 7,119 7,896
SINGAPORE                      
Major Customer Disclosure                      
Revenue                 16,312 12,980 0
Asia-Other                      
Major Customer Disclosure                      
Revenue                 6,685 8,155 $ 3,006
India                      
Major Customer Disclosure                      
Property, plant and equipment, net 1,300       900       1,300 900  
Other foreign locations                      
Major Customer Disclosure                      
Property, plant and equipment, net $ 100       $ 100       $ 100 $ 100