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Leases - The Company as Lessee - Schedule of total amount of lease payments on an undiscounted basis (Detail) - USD ($) | Dec. 31, 2019 | Jan. 01, 2019
--- | --- | ---
Discount rate upon adoption | 5.60% |
2020 | $ 478,140 |
Lessee, Operating Lease, Liability, Payments, Due | 478,140 |
Operating Lease, Liability | 473,132 | $ 1,492,697
Lease liabilities - short term | 473,132 |
Total lease liabilities | 473,132 | $ 1,492,697
Discount based on incremental borrowing rate | $ 5,008 |
Chartered-in contract greater than 12 months [Member] |  |
Discount rate upon adoption | 5.60% | 5.60%
2020 | $ 390,000 |
Lessee, Operating Lease, Liability, Payments, Due | 390,000 |
Operating Lease, Liability | 386,388 | $ 1,492,697
Lease liabilities - short term | 386,388 |
Total lease liabilities | 386,388 | $ 1,492,697
Discount based on incremental borrowing rate | $ 3,612 |
Office leases [Member] |  |
Discount rate upon adoption | 5.60% |
2020 | $ 88,140 |
Lessee, Operating Lease, Liability, Payments, Due | 88,140 |
Operating Lease, Liability | 86,744 |
Lease liabilities - short term | 86,744 |
Total lease liabilities | 86,744 |
Discount based on incremental borrowing rate | $ 1,396 |

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- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease, due in next fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Weighted average discount rate for operating lease calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(4) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
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