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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) Customer Segment | Sep. 30, 2016 USD ($) | 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 | $ 2,021,000 | $ 1,395,000 | $ 5,605,000 | $ 4,337,000 |
Reservation revenue recognized | 7,500,000 | 5,000,000 | 22,500,000 | 10,541,000 |
Revenue generated from transportation | 13,925,000 | 0 | 31,547,000 | 121,000 |
Amount related to minimum commitments under customer contracts due or payable | 0 | 0 | $ 0 | 0 |
Accounts receivables due period |  |  | 30 days |  |
Accounts receivables, allowance for doubtful accounts | 0 |  | $ 0 |  | $ 0
Deferred revenue balance | 0 |  | 0 |  | 1,615,000
Cost of goods sold generated from shipping | 15,390,000 | 0 | 33,544,000 | 157,000 |
Inventory write-down | 0 | 0 | 0 | 0 |
Amortization of deferred financing cost | 116,000 | 37,000 | 339,000 | 117,000 |
Accretion of debt discount costs | 0 | 73,000 | 0 | 232,000 |
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 | $ 1,169,000 | $ 0 | $ 1,244,000 | $ 2,997,000 |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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