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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 |  |  |

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