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Related-Party Transactions - Details of Amounts Due to Related Parties on Our Accompanying Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Related Party Transaction [Line Items] |  |
Base management fee | $ 974 | $ 736
Capital gains fee | 0 | (150)
Credits to fees | (974) | (44)
Other | 18 | 63
Total due to Adviser | 18 | 605
Administration fee | 250 | 340
Total due to Administrator | 250 | 340
Total due to related parties | 364 | 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
Selling Commissions and Dealer-Manager Fees | 96 | 0
Total due to related parties | $ 96 | $ 0

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