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Summary of Significant Accounting Policies - Narrative (Details) |  | 12 Months Ended
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Dec. 31, 2019 USD ($) property | Dec. 31, 2020 USD ($) property tenant | Dec. 31, 2019 USD ($) property tenant | Dec. 22, 2019 USD ($)
Product Information [Line Items] |  |  |  |
Number of properties provided rent deferral (as a percent) | property |  | 12 |  |
Number of properties provided rent abatement (as a percent) | property |  | 15 |  |
Collection of rents due (as a percent) |  | 100.00% |  |
Depreciation and amortization | $ 195,000 | $ 15,459,000 |  | $ 10,422,000
Depreciation | 100,000 | 10,700,000 |  | 8,400,000
Amortization | $ 100,000 | $ 4,800,000 |  | 2,000,000.0
Number of real estate properties held for sale | property | 2 | 3 | 2 |
Restricted cash |  | $ 14,800,000 |  |
Readiness expenses | $ 0 | 2,200,000 |  | 500,000
Acquisition related expenses | $ 100,000 | $ 1,000,000.0 |  | $ 100,000
Annual required distribution |  |  | $ 200,000 |
Number of tenants | tenant |  | 63 |  |
Number of properties leased | property |  | 219 | 123 |
Annualized Base Rent | Customer Concentration Risk | COVID-19, Rent Deferral |  |  |  |
Product Information [Line Items] |  |  |  |
Concentration risk (as a percent) |  | 0.50% |  |
Annualized Base Rent | Customer Concentration Risk | COVID-19, Rent Abatement |  |  |  |
Product Information [Line Items] |  |  |  |
Concentration risk (as a percent) |  | 1.70% |  |
Revenue Benchmark | Customer Concentration Risk | CVS |  |  |  |
Product Information [Line Items] |  |  |  |
Concentration risk (as a percent) |  |  | 12.60% |
Number of tenants | tenant |  |  | 48 |

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