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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Related Party Transaction [Line Items]          
Management fee $ 754 $ 530 $ 1,411 $ 924  
Incentive fee 0 76 0 427  
Credits to fees from Adviser (174) 0 (174) 0  
Total fees to our Adviser 580 606 1,237 1,351  
Administration fee 275 219 549 445  
Financing Fees to Gladstone Securities 2 2 2 2  
Deferred management fees         $ 193
Crop inventory 0   0   $ 1,528
Taxable REIT Subsidiary          
Related Party Transaction [Line Items]          
Management fee 94   161    
Administration fee 17   30    
Deferred management fees 28   28    
Preferred Stock | Series B Preferred Stock          
Related Party Transaction [Line Items]          
Management fee $ 50 $ 0 $ 50 $ 0