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Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) a lease | Sep. 30, 2017 USD ($) a | Sep. 30, 2018 USD ($) a lease | Sep. 30, 2017 USD ($) a | Aug. 30, 2018 a | Jun. 11, 2018 a | Dec. 31, 2017 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Area of real estate property (in acres) | a | 67,826 | 61,794 | 67,826 | 61,794 |  |  |
Crop inventory | $ 0 |  | $ 0 |  |  |  | $ 1,528
Loss on write-down of inventory | $ 33 | $ 0 | $ 1,093 | $ 0 |  |  |
Number of operating ground lease arrangements | lease | 2 |  | 2 |  |  |  |
Taxable REIT Subsidiary |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Allocation of overhead costs | $ 3 |  | $ 31 |  |  |  |
Ventura County California |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Area of real estate property (in acres) | a |  |  |  |  | 164 | 169 |

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