Annual report pursuant to Section 13 and 15(d)

Equity Equity - 2017 Equity Issuances (Details)

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Equity Equity - 2017 Equity Issuances (Details) - USD ($)
 1 Months Ended 12 Months Ended
Oct. 13, 2017
Sep. 30, 2017
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Aug. 07, 2015
Subsidiary, Sale of Stock [Line Items]            
Common stock, shares issued (in shares)       13,791,574 10,024,875  
Public Offering            
Subsidiary, Sale of Stock [Line Items]            
Sale of stock, number of shares issued in transaction (in shares)   1,150,000        
Sale of stock (in dollars per share)   $ 12.25 $ 11.35      
Gross proceeds from issuance of common stock   $ 14,100,000        
Net proceeds from issuance of common stock   $ 13,400,000        
Over-Allotment Option            
Subsidiary, Sale of Stock [Line Items]            
Common stock, shares issued (in shares)     1,825,749      
Sale of stock, number of shares issued in transaction (in shares)   150,000 145,749      
Gross proceeds from issuance of common stock     $ 20,700,000      
Net proceeds from issuance of common stock     $ 19,600,000      
At-the-Market Program            
Subsidiary, Sale of Stock [Line Items]            
Common stock, shares issued (in shares)       608,636    
Sale of stock, number of shares issued in transaction (in shares) 121,875     544,075    
Sale of stock (in dollars per share)       $ 13.04    
Gross proceeds from issuance of common stock       $ 7,100,000    
Net proceeds from issuance of common stock       $ 7,000,000    
Common Stock Value Authorized Under Equity Offering Program           $ 30,000,000.0
Public offering price (in dollars per share)       $ 12.75    
Common Stock, Value, Outstanding       $ 7,800,000    
Common Stocks, Including Additional Paid in Capital, Net of Discount       $ 7,600,000