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Organization and Basis of Presentation - Additional Information (Detail) - USD ($)
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2018
Organization And Basis Of Presentation [Line Items]      
Credit facilities and project related loans scheduled to mature various periods during the next twelve months $ 15,500,000    
Accounting Standards Update 2016-15 [Member]      
Organization And Basis Of Presentation [Line Items]      
Reclassification of cash and restricted cash 1,200,000 $ 1,000,000  
Comstock Asset Management, L.C. [Member]      
Organization And Basis Of Presentation [Line Items]      
Fixed annual payment $ 1,000,000   $ 1,000,000
Aggregate deposit     $ 2,500,000