Annual report pursuant to Section 13 and 15(d)

Related-Party Transactions - Details of Amounts Due to Related Parties on Our Accompanying Condensed Consolidated Balance Sheets (Detail)

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Related-Party Transactions - Details of Amounts Due to Related Parties on Our Accompanying Condensed Consolidated Balance Sheets (Detail) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related Party Transaction [Line Items]      
Management fee due to Adviser(1) $ 666,000 $ 384,000  
Incentive fee due to Adviser 0 169,000  
Other due to Adviser 16,000 2,000  
Total due to Adviser 682,000 555,000  
Administration fee due to Administrator(3) 258,000 202,000  
Other due from administrator 0 (6,000)  
Total due to Administrator 258,000 196,000  
Total due to related parties [1] 940,000 751,000  
Professional fees 713,000    
Administration fee [2] 914,000 $ 771,000 $ 680,000
Taxable REIT Subsidiary      
Related Party Transaction [Line Items]      
Professional fees 71,000    
Administration fee $ 22,000    
[1] Refer to Note 6, “Related-Party Transactions,” for additional information.
[2] Refer to Note 6, “Related-Party Transactions,” for additional information.