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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Prepaid Expense and Other Assets [Abstract]
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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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

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