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Revenue Participation Rights - Additional Information (Detail)	1 Months Ended	9 Months Ended
	Feb. 28, 2011 USD ($)	Sep. 30, 2018 USD ($) Project Investment $ / Security shares
Deferred Revenue Arrangement [Line Items]
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] | "Cambridge" Project [Member]
Deferred Revenue Arrangement [Line Items]
Revenue participation certificates per unit value | $ / Security		50,000
Revenue Participation Certificates [Member] | "Seattle" Project [Member]
Deferred Revenue Arrangement [Line Items]
Revenue participation certificates per unit value | $ / Security		50,000
First Payment [Member] | "Cambridge" Project [Member]
Deferred Revenue Arrangement [Line Items]
Percentage of revenue owed to certificate holders		100.00%
Revenue owed to certificate holder		$ 825,000
Second Payment [Member] | "Cambridge" Project [Member]
Deferred Revenue Arrangement [Line Items]
Percentage of revenue owed to certificate holders		24.75%
Second Payment [Member] | "Cambridge" Project [Member] | Minimum [Member]
Deferred Revenue Arrangement [Line Items]
Revenue owed to certificate holder		$ 4,000,000
Second Payment [Member] | "Cambridge" Project [Member] | Maximum [Member]
Deferred Revenue Arrangement [Line Items]
Revenue owed to certificate holder		$ 35,000,000
Third Payment [Member] | "Cambridge" Project [Member]
Deferred Revenue Arrangement [Line Items]
Percentage of revenue owed to certificate holders		12.375%
Revenue owed to certificate holder		$ 35,000,000

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-12.6(a)(2))
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 946
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-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010

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