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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, 2020 | Dec. 31, 2019
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Related Party Transactions [Abstract] |  |
Base management fee | $ 1,130 | $ 881
Incentive fee | 883 | 847
Other, net | 18 | 25
Total due to Adviser | 2,031 | 1,753
Administration fee | 363 | 341
Cumulative accrued but unpaid portions of prior Administration Fees | 75 | 75
Total due to Administrator | 438 | 416
Total due to Gladstone Securities | 15 | 0
Total due to related parties | $ 2,484 | $ 2,169

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