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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |
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Dec. 31, 2016 USD ($) Customer Segment | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 18, 2015 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |
Number of customers with supply agreement | Customer | 4 |  |  |
Agreements expiring period | 2019 |  |  |
Agreements expiring period | 2020 |  |  |
Rail car revenue recognized | $ 5,732,000 | $ 3,543,000 | $ 1,563,000 |
Reservation revenue recognized | 15,041,000 | 1,000,000 | 0 |
Amount related to minimum commitments under customer contracts due or payable | $ 0 | 0 | 0 |
Accounts receivables due period | 30 days |  |  |
Accounts receivables, allowance for doubtful accounts | $ 0 | 0 |  |
Deferred revenue balance | 1,615,000 | 7,133,000 |  |
Revenue generated from shipping | 480,000 | 2,294,000 | 3,972,000 |
Cost of goods sold generated from shipping | 1,172,000 | 2,257,000 | 4,246,000 |
Inventory write-down | 0 |  |  |
Debt, face amount | 1,178,000 | 486,000 |  |
Amortization of deferred financing cost | 159,000 | 251,000 | 86,000 |
Accretion expense of debt discount | 263,000 | 519,000 | 183,000 |
Accelerated amortization of debt issuance costs | 18,000 |  |  |
Recognized income tax interest and penalties | 0 |  |  |
Probable environmental matters | $ 0 |  |  |
Number of operating segment | Segment | 1 |  |  |
Revolving Credit Facility |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Long-term Line of Credit | $ 0 |  |  | $ 75,000,000
Unbilled Revenues [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Deferred revenue | 0 | 3,875,000 |  |
Take-or-pay Contracts [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Revenue recognized relating to minimum required payments | $ 20,902,000 | $ 10,095,000 | $ 0 |

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