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Summary of Significant Accounting Policies - Additional Information (Detail) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 18, 2015 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) Segment Customer | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) Customer | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Number of customers with supply agreement | Customer |  |  |  | 4 |  | 5 |  |
Agreements expiring period |  |  |  | 2016 |  |  |  |
Agreements expiring period |  |  |  | 2020 |  |  |  |
Rail car revenue recognized |  | $ 1,395,000 | $ 865,000 | $ 4,337,000 | $ 2,521,000 | $ 3,543,000 | $ 1,563,000 |
Monthly reservation charges revenue recognized under certain customer contracts |  | 5,000,000 | 0 | 10,541,000 | 0 |  |  |
Amount related to minimum commitments under customer contracts due or payable |  | 0 |  | $ 0 |  | $ 0 | 0 |
Accounts receivables due period |  |  |  | 30 days |  | 30 days |  |
Accounts receivables, allowance for doubtful accounts |  | 189,000 |  | $ 189,000 |  | $ 0 | 161,000 |
Deferred revenue balance |  | 5,204,000 |  | 5,204,000 |  | 7,133,000 | 0 |
Revenue generated from shipping |  | 0 | 0 | 121,000 | 2,294,000 | 2,294,000 | 3,972,000 |
Cost of goods sold generated from shipping |  | 0 | 0 | 157,000 | 2,257,000 | 2,257,000 | 4,246,000 |
Inventory write-down |  | 0 | 0 | 0 | 0 |  |  |
Fees attributable to lender |  | 1,664,000 |  | 1,664,000 |  | 1,664,000 |  |
Amortization of deferred financing cost |  | 37,000 | 37,000 | 117,000 | 107,000 | 251,000 | 86,000 |
Accretion expense of debt discount |  | 73,000 | 73,000 | 232,000 | 217,000 | 519,000 | 183,000 |
Accelerated amortization of debt issuance costs | $ 324,000 |  |  | 18,000 |  |  |  |
Recognized income tax interest and penalties |  |  |  | 0 |  |  |  |
Probable environmental matters |  | 0 |  | $ 0 |  | 0 |  |
Number of operating segment | Segment |  |  |  | 1 |  |  |  |
Cash exceeding federally insured limits value |  |  |  |  |  | 250,000 |  |
Impairment of long lived assets |  |  |  |  |  |  | 0 |
Asset retirement obligation |  | 1,234,000 |  | $ 1,234,000 |  | 1,180,000 | 1,765,000 | $ 204,000
Unbilled Revenues |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Deferred revenue |  |  |  |  |  | 3,875,000 | $ 0 |
Take-or-pay Contracts [Member] |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Revenue recognized relating to minimum required payments |  | $ 0 | $ 0 | $ 2,997,000 | $ 0 | $ 10,095,000 |  |

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