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Related-Party Transactions - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |  |  |  |
Base management fee | $ 690 | $ 523 | $ 2,102 | $ 1,446 |
Incentive fee | 0 | 261 | 0 | 688 |
Capital gains fee | 778 | 0 | 778 | 0 |
Credits to fees from Adviser | (796) | (54) | (970) | (54) |
Total fees to our Adviser | 672 | 730 | 1,910 | 2,080 |
Administration fee | 387 | 211 | 935 | 656 |
Financing fee | 57 | 28 | 59 | 30 |
Total fees to Gladstone Securities | 947 | 28 | 999 | 30 |
Administration fee | 340 |  | 340 |  | $ 258
Crop inventory | 0 |  | 0 |  | $ 1,528
Taxable REIT Subsidiary |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Base management fee | 94 |  | 176 |  |
Administration fee | 18 |  | 48 |  |
Allocation of overhead costs | 3 |  | 31 |  |
Administration fee | 18 |  | 18 |  |
Preferred Stock | Series B Preferred Stock |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Base management fee | 890 | $ 0 | 940 | $ 0 |
Gladstone Securities |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Administration fee |  |  | 57 |  |
Gladstone Securities |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Payment of management fees | $ 843 |  | $ 890 |  |

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