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Accrued Severance, Severance Assets and Retirement Plans - Breakdown of Company's Severance Liability and Severance Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]    
Current severance liability (included in Accrued payroll, payroll taxes and social benefits) $ 279 $ 41
Non-current severance liability 4,984
Total severance liability 279 5,025
Current severance assets (included in Other current assets) 51
Non-current severance assets 3,558
Total severance assets $ 3,609