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Leases &#8212; The Company as Lessee - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 16, 2016 | Dec. 31, 2014 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019 | Jun. 30, 2017
Incremental borrowing rate |  |  |  | 5.60% |  |  |  |
Operating Lease, Weighted Average Remaining Lease Term |  |  |  | 7 years 6 months |  |  |  |
Operating Lease, Payments |  |  |  | $ 1,647,192 |  |  |  |
Operating Lease Term Of Contract |  |  |  |  |  |  |  | 5 years
Office Space [Member] |  |  |  |  |  |  |  |
Incremental borrowing rate |  |  |  | 5.60% |  |  |  |
Operating lease monthly rent expense |  |  |  | $ 6,500 | $ 7,345 |  |  |
Time Charter In Contracts [Member] |  |  |  |  |  |  |  |
Incremental borrowing rate |  |  |  | 5.60% |  |  | 5.60% |
Time Charter In Contracts [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Operating Lease Term Of Contract |  |  |  | 5 years |  |  |  |
Time Charter In Contracts [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Operating Lease Term Of Contract |  |  |  | 1 year |  |  |  |
Charter Hire Expenses [Member] | Bareboat Charters [Member] |  |  |  |  |  |  |  |
Current Period Gain Recognized |  |  |  | $ 130,000 |  |  |  |
Gas Premiership And Gas Cathar [Member] |  |  |  |  |  |  |  |
Sale leaseback transaction, term of lease | 5 years 3 months 18 days | 4 years |  |  |  |  |  |
Deferred gain gross |  | $ 780,695 |  |  |  |  |  |
Gas Premiership And Gas Cathar [Member] | Charter Hire Expenses [Member] |  |  |  |  |  |  |  |
Current Period Gain Recognized |  |  |  | 0 | 190,087 | $ 195,040 |  |
Gas Premiership And Gas Cathar [Member] | Charter Hire Expenses [Member] | Bareboat Charters [Member] |  |  |  |  |  |  |  |
Operating Lease Rent Expense |  |  |  | $ 1,560,000 | $ 3,434,250 | $ 3,719,810 |  |
Astrid and Kazak [Member] |  |  |  |  |  |  |  |
Sale leaseback transaction, term of lease |  |  | 12 months |  | 12 months |  |  |

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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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