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Related-Party Transactions - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Detail) - USD ($) | 8 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |  |
Base management fee |  | $ 2,837,000 | $ 2,041,000
Incentive fee |  | 0 | 688,000
Capital gains fee |  | 628,000 | 0
Credits to fees from Adviser |  | (1,014,000) | (54,000)
Total fees to our Adviser, net |  | 2,451,000 | 2,675,000
Administration fee |  | 1,275,000 | 914,000
Payment of management fees |  |  | 0
Financing fee |  | 83,000 | 36,000
Total fees to Gladstone Securities |  | 2,407,000 | 36,000
Crop inventory |  | 0.0 | 1,528,000
Taxable REIT Subsidiary |  |  |
Related Party Transaction [Line Items] |  |  |
Base management fee |  | 176,000 |
Administration fee |  | 57,000 | 22,000
Allocation of overhead costs |  | 31,000 |
Professional fees | $ 207,000 | 136,000 | $ 71,000
Preferred Stock | Series B Preferred Stock |  |  |
Related Party Transaction [Line Items] |  |  |
Payment of management fees |  | (2,324,000) |
Gladstone Securities |  |  |
Related Party Transaction [Line Items] |  |  |
Payment of management fees |  | $ (2,200,000) |
Affiliate | Gladstone Securities |  |  |
Related Party Transaction [Line Items] |  |  |
Financing fees as a percent of total financings secured |  | 0.11% | 0.13%

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