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Prepaid Expenses and Other Current Assets | 9 Months Ended
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Sep. 30, 2018
Prepaid Expense and Other Assets [Abstract] |
Prepaid Expenses and Other Current Assets | 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 |

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