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Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
DeferredPaymentPlan
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
DeferredPaymentPlan
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2019
USD ($)
Significant Accounting Policies [Line Items]            
Federal Deposit Insurance Corporation deposit insurance limit per institution $ 250,000   $ 250,000      
Restricted cash 6,509,000   $ 6,509,000   $ 4,545,000  
Acquisition of above-market in-place leases, amortization period     6 months      
Amortization expense for intangible assets 186,000 $ 294,000 $ 557,000 $ 850,000    
Write-off of fully amortized intangible assets 503,000 719,000 950,000 1,532,000    
Additional amortization expense on current in-place intangible assets 74,000   74,000      
Depreciation expense 15,045,000 12,427,000 29,502,000 24,318,000    
Casualty losses $ 411,000   $ 411,000      
Number of deferred payment plans | DeferredPaymentPlan 260   260      
Percentage of rent deferment 0.90%          
Deferred rent receivables from residents $ 413,000   $ 413,000      
Provision for doubtful accounts 723,000   723,000      
Advertising expenses 551,000 603,000 1,160,000 1,151,000    
Transfers of assets between Level 1 and Level 2 0   0      
Transfers of assets between Level 2 and Level 1 0   0      
Transfers of liabilities between Level 1 and Level 2 0   0      
Transfers of liabilities between Level 2 and Level 1 0   0      
Income tax expense 0 0 $ 0 0    
Taxable income distributable to stockholders     90.00%      
Retained earnings (accumulated deficit) (169,585,000)   $ (169,585,000)   $ (141,525,000)  
Cumulative Effect, Period of Adoption, Adjustment            
Significant Accounting Policies [Line Items]            
Retained earnings (accumulated deficit) 0   0      
Topic 842            
Significant Accounting Policies [Line Items]            
Right-of-use assets $ 2,664,000   $ 2,664,000     $ 308,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssets   us-gaap:OtherAssets      
Lease liability $ 3,024,000   $ 3,024,000     $ 308,000
Operating Lease, Liability, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilities   us-gaap:OtherLiabilities      
Total operating lease expense $ 158,000   $ 297,000      
Natural Disasters and Other Insurable Events            
Significant Accounting Policies [Line Items]            
Rent revenue recognized 148,000 $ 17,000 $ 151,000 $ 23,000    
Building and Building Improvements            
Significant Accounting Policies [Line Items]            
Depreciable Lives     40 years      
Leases Acquired In Place            
Significant Accounting Policies [Line Items]            
Acquisition of above-market in-place leases $ 221,000   $ 221,000      
Minimum            
Significant Accounting Policies [Line Items]            
Percentage of rent deferment on monthly rent     25.00%      
Deferred rent payment term     1 month      
Minimum | Equipment and Fixtures            
Significant Accounting Policies [Line Items]            
Depreciable Lives     5 years      
Maximum            
Significant Accounting Policies [Line Items]            
Cash and cash equivalents maturity period     3 months      
Percentage of rent deferment on monthly rent     75.00%      
Deferred rent payment term     3 months      
Maximum | Topic 842            
Significant Accounting Policies [Line Items]            
Operating lease term 10 years   10 years      
Maximum | Equipment and Fixtures            
Significant Accounting Policies [Line Items]            
Depreciable Lives     10 years