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Commitments and Contingencies (Details Textual) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended
Dec. 31, 2016
Jul. 31, 2017
Loss Contingencies [Line Items]    
Underpaid duty charges due to alternative duty methodology $ 5.1  
Underpaid duty methodology period covered by statute of limitation 5 years  
Other Current Assets    
Loss Contingencies [Line Items]    
Restricted cash deposits released   $ 1.0