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Deferred Income and Revenue Participation Rights - Participating Revenue Rights (Detail) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Deferred Revenue Arrangement [Line Items]
Revenue participation rights	$ 3,818,750	$ 4,643,750
"Cambridge" Project [Member]
Deferred Revenue Arrangement [Line Items]
Revenue participation rights	0	825,000
"Seattle" Project [Member]
Deferred Revenue Arrangement [Line Items]
Revenue participation rights	62,500	62,500
Galt Resources, LLC (HMS Victory project) [Member]
Deferred Revenue Arrangement [Line Items]
Revenue participation rights	$ 3,756,250	$ 3,756,250

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765

+ Details

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- Details

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- Details

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- Details

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