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Leases - Additional Information (Detail) $ in Thousands | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Feb. 28, 2018 USD ($) | Sep. 30, 2019 USD ($) City | Sep. 30, 2018 USD ($) | Dec. 31, 2014
Liquefaction plants and systems |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Equipment lease, term of contract |  | 1 year |  |  |  |
Monthly payments |  | $ 13 |  |  |  |
February 2018 Through December 2018 |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Sublease income |  |  | $ 5 |  |  |
January 2019 And Thereafter |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Sublease income |  |  | $ 2 |  |  |
Denver, Colorado |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Non-cancelable operating leases term |  |  |  |  |  | 5 years
Total rent expense |  |  |  | $ 74 | $ 175 |
Fort Lupton, Colorado |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Equipment lease, term of contract | 1 year |  |  |  |  |
Monthly payments | $ 2 |  |  |  |  |
Minimum |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Remaining operating lease term |  |  |  | 1 year |  |
Maximum |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Remaining operating lease term |  |  |  | 5 years |  |
M&I Brazil |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Number of cities in which offices and facilities were leased | City |  |  |  | 3 |  |

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- Definition Remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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