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Equity, Common Stock (Details) - Common Stock [Member] - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Aug. 31, 2018
Jul. 30, 2018
Common Stock [Abstract]                  
Number of shares of common stock sold (in shares) 203,754 467,928 560,338 4,083,377 1,320,921 1,751,689      
Universal Shelf Registration Statement [Member] | Maximum [Member]                  
Common Stock [Abstract]                  
Securities offered for sale, aggregate value                 $ 100,000
ATM Agreement [Member]                  
Common Stock [Abstract]                  
Number of shares of common stock sold (in shares) 203,754           1,232,020    
Average sales price per common share (in dollars per share) $ 6.17           $ 5.79    
Aggregate proceeds from sales of common stock $ 1,257           $ 7,131    
Sales commissions, fees and other costs associated with issuance of common stock 38           214    
ATM Agreement [Member] | Maximum [Member]                  
Common Stock [Abstract]                  
Securities offered for sale, aggregate value $ 30,327           $ 30,327 $ 50,000