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Related Party Transactions - Summary of Related Party Costs - Related Party Transactions (Parenthetical) (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jul. 10, 2019
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]          
Liability for future payment     $ 10,333,792   $ 9,043,433
Reduction in due to affiliates     $ (1,290,359) $ (1,185,390)  
Primary Offering And Termination of Dealer Manager [Member]          
Related Party Transaction [Line Items]          
Reduction in due to affiliates   $ 600,000      
Primary Offering And Termination of Dealer Manager [Member] | Minimum [Member]          
Related Party Transaction [Line Items]          
Underwriting compensation     10.00%    
Percentage of receivable from advisor for organization and offering expenses incurred   1.00%      
Stockholder Servicing Fees and Dealer Manager Servicing Fees [Member]          
Related Party Transaction [Line Items]          
Liability for future payment     $ 0    
Advisor Funding Agreement [Member]          
Related Party Transaction [Line Items]          
Maximum period for reimbursement of offering expenses 60 days 60 days 60 days    
Advisor Funding Agreement [Member] | Minimum [Member]          
Related Party Transaction [Line Items]          
Percentage of organization and offering expenses funded by our advisor     1.00%    
Advisor Funding Agreement [Member] | Maximum [Member]          
Related Party Transaction [Line Items]          
Percentage of organization and offering expenses funded by our advisor     1.00%    
Class Y and Z Common Stock [Member] | Minimum [Member]          
Related Party Transaction [Line Items]          
Percentage of organization and offering expenses funded by our advisor     1.00%    
Class Y and Z Common Stock [Member] | Primary Offering And Termination of Dealer Manager [Member] | Minimum [Member]          
Related Party Transaction [Line Items]          
Percentage of organization and offering expenses expected at termination of public offering   1.00%      
Class Y and Z Common Stock [Member] | Advisor Funding Agreement [Member]          
Related Party Transaction [Line Items]          
Reimbursement of offering cost rate     1.00%    
Select Capital Corporation (Dealer Manager) [Member]          
Related Party Transaction [Line Items]          
Underwriting compensation     10.00%    
Select Capital Corporation (Dealer Manager) [Member] | Class T and Y Common Stock [Member] | Additional Paid In Capital Selling Commissions [Member]          
Related Party Transaction [Line Items]          
Monthly stockholder servicing fee accrual description     accrued daily in an amount equal to 1/365th of 1% of the purchase price per share    
Select Capital Corporation (Dealer Manager) [Member] | Class W and Z Common Stock [Member] | Additional Paid In Capital Selling Commissions [Member]          
Related Party Transaction [Line Items]          
Monthly stockholder servicing fee accrual description     accrued daily in an amount equal to 1/365th of 0.5% of the purchase price per share    
Monthly stockholder servicing fee accrual description     accrued daily in an amount equal to 1/365th of 0.5% of the purchase price per share