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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) Customer Segment | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of customers with supply agreement | Customer |  |  | 5 |  |
Agreements expiring period |  |  | 2019 |  |
Agreements expiring period |  |  | 2020 |  |
Rail car revenue recognized | $ 1,900,000 | $ 1,389,000 | $ 3,583,000 | $ 2,942,000 |
Reservation revenue recognized | 7,500,000 | 2,772,000 | 15,000,000 | 5,541,000 |
Revenue generated from transportation | 11,018,000 | 121,000 | 17,622,000 | 121,000 |
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 |  | 0
Deferred revenue balance | 5,000 |  | 5,000 |  | 1,615,000
Cost of goods sold generated from shipping | 10,852,000 | 157,000 | 18,154,000 | 157,000 |
Inventory write-down | 0 | 0 | 0 | 0 |
Amortization of deferred financing cost | 117,000 | 43,000 | 222,000 | 80,000 |
Accretion of debt discount costs | 0 | 85,000 | 0 | 159,000 |
Recognized income tax interest and penalties |  |  | 0 |  |
Probable environmental matters | 0 |  | $ 0 |  | 0
Number of operating segment | Segment |  |  | 1 |  |
Revolving Credit Facility |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Long-term Line of Credit | 0 |  | $ 0 |  | $ 0
Take-or-pay Contracts |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue recognized for shortfall payments relating to minimum commitments | $ 74,000 | $ 0 | $ 74,000 | $ 2,997,000 |

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