Selected Quarterly Data - Summary of Quarterly Financial Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Schedule Of Quarterly Financial Information [Line Items]                  
Total revenues $ 31,363,122 $ 29,469,545 $ 30,298,123 $ 30,076,693 $ 29,588,014        
Total operating expenses 26,992,137 27,497,027 61,368,274 26,965,933 27,773,486     $ 115,857,438 $ 74,919,300
Operating income (loss) 4,370,985 1,972,518 (31,070,151) 7,055,456 1,814,528     (24,726,648) 4,532,556
Net loss (4,456,497) (7,062,841) (37,743,581) (4,321,670) (9,541,579)     (49,262,919) (20,773,868)
Net loss attributable to common stockholders $ (6,259,114) $ (8,491,421) $ (35,073,951) $ (5,431,504) $ (8,214,826) $ (2,212,445) $ (8,891,558) $ (49,824,486) $ (19,318,829)
Class A Common stock                  
Schedule Of Quarterly Financial Information [Line Items]                  
Net loss per share-basic and diluted $ (0.10) $ (0.14) $ (0.59) $ (0.09) $ (0.14)     $ (0.84) $ (0.33)
Class T Common stock                  
Schedule Of Quarterly Financial Information [Line Items]                  
Net loss per share-basic and diluted $ (0.10) $ (0.14) $ (0.59) $ (0.09) $ (0.14)     $ (0.84) $ (0.33)