Quarterly report pursuant to Section 13 or 15(d)

Related-Party Transactions - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Detail)

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Related-Party Transactions - Summary of Management Fees, Incentive Fees and Associated Credits and Administration Fees (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Related Party Transactions [Abstract]        
Management fee [1] $ 523 $ 385 $ 1,446 $ 1,158
Incentive fee [1] 261 22 688 181
Credits from voluntary, irrevocable waiver granted by Adviser’s board of directors [1] 54 0 54 0
Net fees due to our Adviser 730 407 2,080 1,339
Administration fee [1] 211 184 656 575
Financing Fees to Gladstone Securities $ 28 $ 0 $ 30 $ 0
[1] Refer to Note 6, “Related-Party Transactions,” for additional information.