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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 31, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Property, Plant and Equipment [Line Items] |  |  |  |  |
Short-term investment maturity period |  |  |  | Three months or less |
Restricted cash |  | $ 10,000 |  | $ 10,000 |
Non-cash gain on sale of fixed asset |  | $ 866,604 |  | $ 992,595 |
Weighted average number of common shares outstanding |  | 7,558,835 | 7,481,798 | 7,548,136 | 7,387,952
Odyssey Explorer [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Cash proceeds from sale of vessel | $ 200,000 |  |  |  |
Vessel In-kind [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Value of vessel received in-kind | $ 350,000 |  |  |  |
Minimum [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and Equipment, estimated useful life |  |  |  | 3 years |
Maximum [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Property and Equipment, estimated useful life |  |  |  | 30 years |

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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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