Quarterly report pursuant to Section 13 or 15(d)

Public Offering of Common Stock (Details)

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Public Offering of Common Stock (Details)
$ / shares in Units, $ in Thousands
Oct. 13, 2016
USD ($)
shares
Oct. 07, 2016
item
$ / shares
shares
Sep. 30, 2017
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
Shares of common stock sold     33,393,804 33,008,865
Par value of common stock | $ / shares     $ 0.01 $ 0.01
October 2016 Offering        
Shares of common stock sold   2,333,334    
Public offering price (in dollars per share) | $ / shares   $ 7.50    
Number of days to underwriter to sell additional common shares   30 days    
October 2016 Offering inclusive of over-allotment option        
Shares of common stock sold 2,683,334      
Proceeds from Issuance of Common Stock | $ $ 18,670      
Underwriting Agreement        
Shares of common stock sold 350,000 350,000    
Directors and officers | October 2016 Offering        
Shares of common stock sold   32,666    
Number of directors and officers who purchased common stock | item   5