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Deferred Income and Revenue Participation Rights - Participating Revenue Rights (Detail) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Deferred Revenue Arrangement [Line Items]
Deferred income and participating revenue rights	$ 4,643,750	$ 4,643,750
"Cambridge" Project [Member]
Deferred Revenue Arrangement [Line Items]
Deferred income and participating revenue rights	825,000	825,000
"Seattle" Project [Member]
Deferred Revenue Arrangement [Line Items]
Deferred income and participating revenue rights	62,500	62,500
Galt Resources, LLC (HMS Victory project) [Member]
Deferred Revenue Arrangement [Line Items]
Deferred income and participating revenue rights	$ 3,756,250	$ 3,756,250

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.

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