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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Prepaid Expense and Other Assets [Abstract] |  |
Prepaid insurance | $ 403 | $ 551
Prepaid expenses | 1,576 | 1,112
Prepaid income taxes | 1,751 | 1,382
Rail rebate receivables | 502 | 776
Other receivables | 597 | 28
Total prepaid expenses and other current assets | $ 4,829 | $ 3,849

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