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Revenue Participation Rights - Additional Information (Detail) | 1 Months Ended | 9 Months Ended
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Feb. 28, 2011 USD ($) | Sep. 30, 2020 USD ($) Investment Project $ / Security shares | Sep. 30, 2019 USD ($)
Deferred Revenue Arrangement [Line Items] |  |  |
Deferred revenue |  |  | $ 825,000
Revenue participation agreement |  | $ 15,000,000 |
"Seattle" Project [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Percentage of revenue owed to certificate holder per each million invested |  | 1.00% |
Common shares issued per unit | shares |  | 100,000 |
Galt Resources, LLC [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Percentage of revenue owed to certificate holders |  | 50.00% |
Percentage of revenue owed to certificate holder per each million invested |  | 1.00% |
Investment multiplier in case of project success | Investment |  | 3 |
Projects after bifurcation | Project |  | 2 |
Galt Resources, LLC [Member] | SS Gairsoppa [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Deferred revenue |  | $ 3,756,250 |
Galt Resources, LLC [Member] | Maximum [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Investment for future revenue rights | $ 7,512,500 |  |
HMS Victory Project [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Percentage of revenue owed to certificate holders |  | 7.5125% |
Revenue Participation Certificates [Member] | "Seattle" Project [Member] |  |  |
Deferred Revenue Arrangement [Line Items] |  |  |
Revenue participation certificates per unit value | $ / Security |  | 50,000 |

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