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Other Accrued Expenses and Other Current Liabilities (Details 1) - Accrued Warranty Costs [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Accrued Expenses and Liability [Line Items]      
Balance at beginning of year $ 48 $ 227 $ 103
Additions charged to expense 146 11 1,121
Amounts utilized (154) (190) (997)
Balance at end of year $ 40 $ 48 $ 227