Deferred Income and Revenue Participation Rights - Participating Revenue Rights (Detail) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Deferred Revenue Arrangement [Line Items]
Deferred income and participating revenue rights	$ 5,026,898	$ 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) [Member]
Deferred Revenue Arrangement [Line Items]
Deferred income and participating revenue rights	3,756,250	$ 3,756,250
Oceanica Call Option [Member]
Deferred Revenue Arrangement [Line Items]
Deferred income and participating revenue rights	$ 383,148