Quarterly report pursuant to Section 13 or 15(d)

Series A Term Preferred Stock (Details)

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Series A Term Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 6 Months Ended
Aug. 31, 2016
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Subsidiary, Sale of Stock [Line Items]        
Common stock, shares issued (in shares)   20,532,770   17,891,340
Proceeds from issuance of preferred and common equity   $ 61,394 $ 25,113  
Offering costs   $ 4,521 $ 935  
Series A Preferred Stock        
Subsidiary, Sale of Stock [Line Items]        
Dividend rate (as percent) 6.375%      
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001   $ 0.001
Average sales price price (in dollars per share) $ 25      
Proceeds from issuance of preferred and common equity $ 27,600      
Redemption price (in dollars per share) $ 25 $ 25.98    
Offering costs $ 1,200      
Fair value of preferred stock   $ 29,900    
Series A Preferred Stock | Preferred Stock        
Subsidiary, Sale of Stock [Line Items]        
Common stock, shares issued (in shares) 1,150,000      
Proceeds from issuance of preferred stock $ 28,800