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Prepaid Expenses and Other Current Assets (Tables)
9 Months Ended
Sep. 30, 2018
Prepaid Expense and Other Assets [Abstract]  
Schedule of prepaid expenses and other current assets
Prepaid expenses and other current assets were comprised of the following:
 
September 30, 2018
 
December 31, 2017
Prepaid insurance
$
103

 
$
551

Prepaid expenses
1,914

 
1,112

Prepaid income taxes
1,750

 
1,382

Rail rebate receivables
477

 
776

Other receivables
623

 
28

Total prepaid expenses and other current assets
$
4,867

 
$
3,849