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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, 2018 | Dec. 31, 2017
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Related Party Transaction [Line Items] |  |
Management fee | $ 736 | $ 666
Capital gains fee | (150) | 0
Credits to fees | (44) | 0
Other due to Adviser | 63 | 16
Total due to Adviser | 605 | 682
Administration fee | 340 | 258
Total due to Administrator | 340 | 258
Total due to related parties | 945 | 940
Taxable REIT Subsidiary |  |
Related Party Transaction [Line Items] |  |
Administration fee | 9 | 22
Gladstone Securities |  |
Related Party Transaction [Line Items] |  |
Due from Gladstone Securities | $ 20 | $ 0

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