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Restructuring Charges (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
employee
Dec. 31, 2014
USD ($)
employee
Dec. 31, 2013
USD ($)
item
Reconciliation of the restructuring liability      
Balance at the beginning of the period $ 1,428 $ 533 $ 1,875
Provision 4,679 4,394 1,485
Payments (5,283) (3,499) (2,827)
Balance at the end of the period 824 1,428 533
Costs associated with termination of employees and temporary staff $ 900    
Number of permanent positions eliminated | employee 16    
Number of temporary positions eliminated | employee 12    
Hyeongok-ri South Korea facility      
Reconciliation of the restructuring liability      
Number of positions eliminated | employee 23    
Personnel Severance and Related Costs      
Reconciliation of the restructuring liability      
Balance at the beginning of the period $ 1,428 533 1,875
Provision 3,513 4,012 1,485
Payments (4,117) (3,117) (2,827)
Balance at the end of the period 824 $ 1,428 $ 533
Number of international sales offices restructured | item     1
Number of positions eliminated | employee   93  
Personnel Severance and Related Costs | Ft. Collins, Colorado and Camarillo, California facilities      
Reconciliation of the restructuring liability      
Provision 2,700    
Facility Closing Costs      
Reconciliation of the restructuring liability      
Provision 1,166 $ 382  
Payments (1,166) (382)  
Facility Closing Costs | Ft. Collins, Colorado and Camarillo, California facilities      
Reconciliation of the restructuring liability      
Provision   $ 400  
Facility Closing Costs | Hyeongok-ri South Korea facility      
Reconciliation of the restructuring liability      
Provision $ 1,100