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Related-Party Transactions - Details of Amounts Due to Related Parties on Our Accompanying Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Related Party Transaction [Line Items] |  |
Base management fee | $ 881 | $ 736
Incentive fee | 847 | 0
Capital gains fee | 0 | (150)
Credits to fees | 0 | (44)
Other, net | 25 | 63
Total due to Adviser | 1,753 | 605
Administration fee | 341 | 340
Cumulative accrued but unpaid portions of prior Administration Fees | 75 | 0
Total due to Administrator | 416 | 340
Total due to related parties | 2,169 | 945
Taxable REIT Subsidiary |  |
Related Party Transaction [Line Items] |  |
Administration fee | 9 |
Gladstone Securities |  |
Related Party Transaction [Line Items] |  |
Due from Gladstone Securities | $ 0 | $ 20

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