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Redeemable Noncontrolling Interest (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Redeemable Noncontrolling Interest [Line Items]      
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount $ 3,656 $ 3,656  
Net loss attributable to the redeemable noncontrolling interest $ 313 $ 143 $ 617