Annual report pursuant to Section 13 and 15(d)

Subsequent Events - Additional Information (Details)

v3.20.4
Subsequent Events - Additional Information (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2021
Feb. 12, 2021
Jan. 31, 2021
Aug. 31, 2016
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jan. 31, 2023
Jan. 13, 2021
Subsequent Event [Line Items]                  
Common stock, shares issued (in shares)           26,219,019 20,936,658    
Proceeds from issuance of preferred and common equity           $ 130,348,000 $ 118,357,000    
Redemption of preferred stock           $ 684,000 $ 340,000    
Series A Preferred Stock                  
Subsequent Event [Line Items]                  
Preferred stock, dividend rate (as percent)       6.375%          
Preferred stock, par value (in dollars per share)       $ 0.001   $ 0.001 $ 0.001    
Weighted-average Offering Price Per Share       $ 25.00          
Proceeds from issuance of preferred and common equity       $ 27,600,000          
Redemption price of redeemable preferred stock (in dollars per share)           25.00      
Preferred stock, liquidation preference (in dollars per share)           $ 25.00 $ 25.00    
Preferred stock, shares authorized (in shares)           2,000,000 2,000,000    
Series A Preferred Stock | Forecast                  
Subsequent Event [Line Items]                  
Anticipated write off         $ 127,000        
Series A Preferred Stock | Subsequent Event                  
Subsequent Event [Line Items]                  
Redemption price of redeemable preferred stock (in dollars per share)   $ 25.00              
Redemption of preferred stock   $ 28,800,000              
Series D Preferred Stock | Forecast                  
Subsequent Event [Line Items]                  
Preferred stock, dividend rate (as percent) 5.00%                
Preferred stock, liquidation preference (in dollars per share) $ 25.00                
Series D Preferred Stock | Subsequent Event                  
Subsequent Event [Line Items]                  
Preferred stock, dividend rate (as percent)     5.00%            
Preferred stock, par value (in dollars per share)     $ 0.001            
Weighted-average Offering Price Per Share     $ 25.00            
Proceeds from issuance of preferred and common equity     $ 58,500,000            
Redemption price of redeemable preferred stock (in dollars per share)               $ 25.00  
Preferred stock, shares authorized (in shares)                 3,600,000
Preferred Stock | Series A Preferred Stock                  
Subsequent Event [Line Items]                  
Proceeds from issuance and preferred stock       $ 28,800,000   $ 28,800,000      
Preferred Stock | Series D Preferred Stock | Subsequent Event                  
Subsequent Event [Line Items]                  
Common stock, shares issued (in shares)     2,415,000            
Proceeds from issuance and preferred stock     $ 60,400,000