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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, 2021 | Dec. 31, 2020
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Related Party Transactions [Abstract] |  |
Base management fee | $ 1,376 | $ 1,130
Incentive fee | 0 | 883
Other | 39 | 18
Total due to Adviser | 1,415 | 2,031
Administration fee | 347 | 363
Cumulative accrued but unpaid portion of prior Administration Fees | 232 | 75
Total due to Administrator | 579 | 438
Due to Gladstone Securities | 0 | 15
Total due to related parties | $ 1,994 | $ 2,484

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