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Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
DeferredPaymentPlan
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
DeferredPaymentPlan
Sep. 30, 2019
USD ($)
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 7,218,000   $ 7,218,000   $ 4,545,000  
Acquisition of above-market in-place leases, amortization period     6 months      
Amortization expense for intangible assets 73,000 $ 308,000 $ 631,000 $ 1,159,000    
Write-off of fully amortized intangible assets 221,000 0 1,171,000 1,532,000    
Depreciation expense 15,159,000 13,127,000 44,660,000 37,445,000    
Casualty losses $ 0   $ 411,000      
Number of deferred payment plans | DeferredPaymentPlan 263   263      
Rent deferment $ 479,000   $ 479,000      
Deferred rent receivable from residents 295,000   295,000      
Provision for doubtful accounts 80,000   803,000      
Advertising expenses 667,000 612,000 1,827,000 1,763,000    
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    
Percentage of minimum taxable income distributable to stockholders     90.00%      
Subsequent disqualification period if failed to qualify as REIT     4 years      
Retained earnings (accumulated deficit) $ (179,834,000)   $ (179,834,000)   $ (141,525,000)  
Change in accounting principle, accounting standards update, adopted [true false] true   true      
Change in accounting principle, accounting standards update, adoption date Jan. 01, 2020   Jan. 01, 2020      
Change in accounting principle, accounting standards update, immaterial effect [true false] true   true      
Accounting Standards Update [Extensible List]     us-gaap:AccountingStandardsUpdate201613Member      
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 $ 2,573,000   $ 2,573,000     $ 308,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssets   us-gaap:OtherAssets      
Lease liability $ 2,930,000   $ 2,930,000     $ 308,000
Operating Lease, Liability, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilities   us-gaap:OtherLiabilities      
Total operating lease expense $ 158,000   $ 454,000      
Change in accounting principle, accounting standards update, adopted [true false]         true  
Change in accounting principle, accounting standards update, adoption date         Jan. 01, 2019  
Change in accounting principle, accounting standards update, immaterial effect [true false]         false  
Topic 718            
Significant Accounting Policies [Line Items]            
Change in accounting principle, accounting standards update, adopted [true false]         true  
Change in accounting principle, accounting standards update, adoption date         Jan. 01, 2019  
Change in accounting principle, accounting standards update, immaterial effect [true false]         true  
Natural Disasters and Other Insurable Events            
Significant Accounting Policies [Line Items]            
Rent revenue recognized $ 32,000 $ 80,000 $ 184,000 $ 103,000    
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      
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