Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Details)

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Subsequent Events - Additional Information (Details) - USD ($)
1 Months Ended
Apr. 11, 2018
Apr. 30, 2018
Apr. 18, 2018
Mar. 31, 2018
Dec. 31, 2017
Subsequent Event [Line Items]          
Common stock, shares authorized       34,200,000 34,200,000
Subsequent event          
Subsequent Event [Line Items]          
Number of shares reclassified to common stock 3,500,000        
Redeemable preferred stock, shares authorized 57,969        
Common stock, shares authorized 87,700,000        
Series D Preferred Stock | Subsequent event          
Subsequent Event [Line Items]          
Gross proceeds of the offering   $ 1,000,000      
Number of shares issued (in shares)   38,708      
Variable rate mortgage loans          
Subsequent Event [Line Items]          
Mortgage notes       $ 62,088,000 $ 69,302,000
Variable rate mortgage loans | Subsequent event          
Subsequent Event [Line Items]          
Mortgage notes     $ 13,000,000.0