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Transactions With Related Parties - Additional Information (Detail) |  |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 25, 2016 EUR (€) | May 26, 2014 EUR (€) | Jun. 30, 2017 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |
Due to related parties, current, total |  |  |  | $ 7,043,121 | $ 7,930,642 |
Revenue from related parties |  |  |  |  |  | $ 1,973,643
Equity Method Investment Ownership Percentage |  |  |  | 50.10% |  |
Proceeds From Unconsolidated Joint Ventures And Subsidiaries Classified As Financing Activities |  |  |  | $ 4,958,250 |  |
Term Of Contract |  |  | 5 years |  |  |
Monthly Rate Of Lease Rentals |  |  | $ 337,250 |  |  |
The Manager [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Management fee, per day, per vessel |  |  |  | 440 |  |
Management fee, per day, per vessel, under bareboat charter |  |  |  | $ 125 |  |
Vessel brokerage commission percentage |  |  |  | 1.25% | 1.25% | 1.25%
Crew management fee, per month, per vessel |  |  |  |  | $ 2,500 |
Sales and purchase broker commission fee, percentage |  |  |  | 1.00% |  |
Due to related parties, current, total |  |  |  | $ 2,084,871 | 7,930,642 |
The Manager [Member] | Additional Charge Per Day When Visits Exceed Five Days In Twelve Month Period [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  |  | 500 |  |
The Manager [Member] | Commission Fees Incurred And Capitalized To The Cost Of Vessels [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  |  | 0 | 1,598,858 | $ 525,978
The Manager [Member] | Voyage Expenses Related Party [Member] | Brokerage Commission Fees [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  |  | 1,788,543 | 2,037,917 | 1,912,505
The Manager [Member] | Management Fees Related Party [Member] | Management Fees [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  |  | 5,730,910 | 7,027,195 | 7,205,490
The Manager [Member] | Vessels Operating Expenses Related Party [Member] | Superintendent Fees [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  |  | 104,000 | 137,000 | 125,500
The Manager [Member] | Vessels Operating Expenses Related Party [Member] | Amounts Paid in Connection to Charter Agreements for the Vessels Operating Expense [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  |  | 0 | 0 | 675,408
The Manager [Member] | Vessels Operating Expenses Related Party [Member] | Crew Management Fees [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  |  | 862,500 | 377,500 |
The Manager [Member] | Net Gain on Sale of Vessels [Member] | Commission Expense Related to the Sale and Leaseback of Vessels [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  |  | 109,000 | 184,000 | 119,900
The Manager [Member] | General and Administrative Expense [Member] | Reimbursed Compensation [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  |  | 1,118,491 | 1,210,036 | 1,127,307
The Manager [Member] | General and Administrative Expense [Member] | Office Space Rent [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  |  | 87,192 | 84,686 | 82,192
The Manager [Member] | Impairment Loss [Member] | Commission Expense Related to the Sale and Leaseback of Vessels [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  |  |  | 212,650 |
Emihar Petroleum Inc [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Revenue from related parties |  |  |  | 0 | 0 | 1,973,643
Brave [Member] | Vessel Construction Fee Per Vessel [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party | € | € 490,000 | € 390,000 |  |  |  |
Brave [Member] | Capitalized Construction Supervision Fees [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party transaction, expenses from transactions with related party |  |  |  | $ 0 | $ 1,790,789 | $ 535,864

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