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Organization and Basis of Presentation - Additional Information (Detail)
 9 Months Ended
Jul. 01, 2019
USD ($)
Apr. 30, 2019
USD ($)
Installment
$ / ft²
shares
Sep. 30, 2019
USD ($)
shares
Feb. 15, 2019
shares
Jan. 01, 2019
USD ($)
Dec. 31, 2018
shares
Organization And Basis Of Presentation [Line Items]            
Capital stock, shares authorized | shares       80,000,000   31,428,571
Lease ROU assets     $ 128,000      
Lease liabilities     $ 128,000      
ASU 2016-02 [Member]            
Organization And Basis Of Presentation [Line Items]            
Lease ROU assets         $ 170,000  
Lease liabilities         $ 170,000  
2019 AMA [Member] | CDS [Member]            
Organization And Basis Of Presentation [Line Items]            
Fixed annual payment   $ 1,000,000        
Agreement extended termination date   Dec. 31, 2027        
Agreement additional extension term   1 year        
Agreement notice period required for non-renewal   180 days        
2019 AMA [Member] | CDS [Member] | Asset Management Fee [Member]            
Organization And Basis Of Presentation [Line Items]            
Percentage of CRE portfolio revenues   2.50%        
2019 AMA [Member] | CDS [Member] | Construction Management Fee [Member]            
Organization And Basis Of Presentation [Line Items]            
Percentage of all costs associated with portfolio projects in development   4.00%        
2019 AMA [Member] | CDS [Member] | Property Management Fee [Member]            
Organization And Basis Of Presentation [Line Items]            
Percentage of CRE portfolio revenues   1.00%        
2019 AMA [Member] | CDS [Member] | Acquisition Fee [Member]            
Organization And Basis Of Presentation [Line Items]            
Maximum percentage of purchase price of an acquired asset   0.50%        
2019 AMA [Member] | CDS [Member] | Disposition Fee [Member]            
Organization And Basis Of Presentation [Line Items]            
Percentage sales price of an asset on disposition   0.50%        
2019 AMA [Member] | Comstock Asset Management, L.C. [Member]            
Organization And Basis Of Presentation [Line Items]            
Cumulative, compounded, preferred return rate   8.00%        
Leasing fee per square foot for new leases | $ / ft²   1.00        
Leasing fee per square foot for renewal leases | $ / ft²   0.50        
2019 AMA [Member] | Comstock Asset Management, L.C. [Member] | Incentive Fee [Member]            
Organization And Basis Of Presentation [Line Items]            
Percentage of free cash flow from real estate assets   10.00%        
2019 AMA [Member] | Comstock Asset Management, L.C. [Member] | Investment Origination Fee [Member]            
Organization And Basis Of Presentation [Line Items]            
Percentage of raised capital   1.00%        
Business Management Agreement [Member] | CDS [Member]            
Organization And Basis Of Presentation [Line Items]            
Annual management fee payable $ 337,500          
Maximum reimbursable expenses of manager per month $ 15,000          
Business Management Agreement [Member] | Comstock Investors X, L.C. [Member]            
Organization And Basis Of Presentation [Line Items]            
Aggregate fee payable   $ 937,500        
Number of installments of fee payment | Installment   15        
Aggregate fee payable, frequency of periodic payment     quarterly      
Fee payable in installments   $ 62,500        
Class A [Member]            
Organization And Basis Of Presentation [Line Items]            
Common stock, shares authorized | shares     59,779,750 59,779,750   11,038,071
Class A [Member] | Master Transfer Agreement [Member] | CDS [Member]            
Organization And Basis Of Presentation [Line Items]            
Shares issued | shares   3,100,000        
Class A [Member] | Master Transfer Agreement [Member] | FR54, LC [Member]            
Organization And Basis Of Presentation [Line Items]            
Number of shared issued in exchange to related party | shares   723,947        
Series C Preferred Stock [Member]            
Organization And Basis Of Presentation [Line Items]            
Preferred Stock, shares authorized | shares     20,000,000 4,500,000   3,000,000
Series C Preferred Stock [Member] | Master Transfer Agreement [Member] | CDS [Member]            
Organization And Basis Of Presentation [Line Items]            
Shares issued | shares   1,220,000        
Series C Preferred Stock [Member] | Master Transfer Agreement [Member] | FR54, LC [Member]            
Organization And Basis Of Presentation [Line Items]            
Number of shares transferred by related party | shares   579,158