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Retirement Plan (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Change in projected benefit obligation:      
Benefit obligation at beginning of year $ 3,535 $ 2,619  
Service cost 16 0 $ 0
Interest cost 72 61 64
Actuarial loss 31 1,097  
Effect of foreign currency rate changes 214 (242)  
Benefit obligation at end of year 3,868 3,535 2,619
Change in plan assets:      
Fair value at beginning of year 2,803 2,705  
Actual return on plan assets 21 70  
Employer contribution 124 119  
Effect of foreign currency rate changes 44 (91)  
Fair value at end of year 2,992 2,803 $ 2,705
Funded status (876) (732)  
Amounts recognized in the balance sheet consist of:      
Prepaid pension costs 188 331  
Accrued pension liabilities (1,064) (1,063)  
Net amount recognized $ (876) $ (732)