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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 |  |  |

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