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Revenue Participation Rights - Additional Information (Detail)
1 Months Ended 3 Months Ended
Feb. 28, 2011
USD ($)
Mar. 31, 2019
USD ($)
Investment
Project
$ / Security
shares
Mar. 31, 2018
USD ($)
Deferred Revenue Arrangement [Line Items]      
Deferred revenue   $ 825,000 $ 0
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