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Commitments and Contingencies - Additional Information (Detail) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 01, 2017 lease farm | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jan. 01, 2019 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Number of farms acquired | farm | 2 |  |  |
Number of leases | lease | 2 |  |  |
Operating lease right-of-use assets |  | $ 178 |  |
Operating lease liabilities |  | $ 172 |  |
Weighted-average discount rate |  | 4.20% |  |
Lease expense |  | $ 50 | $ 48 |
ASU 2016-02 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Operating lease right-of-use assets |  |  |  | $ 218
Operating lease liabilities |  |  |  | $ 213
Minimum | ASU 2016-02 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Weighted-average discount rate |  |  |  | 2.47%
Maximum | ASU 2016-02 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Weighted-average discount rate |  |  |  | 2.53%

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