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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]    
Derivative liabilities $ 30 $ 32
Fair Value [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Derivative liabilities 30 32
Level 1 [Member] | Fair Value [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Derivative liabilities
Level 2 [Member] | Fair Value [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Derivative liabilities 30 32
Level 3 [Member] | Fair Value [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Derivative liabilities