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Stockholders' Equity and Non-controlling Interests - Summary of the non-vested Restricted Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
May 03, 2017
May 02, 2017
Dec. 31, 2016
Sep. 15, 2015
Weighted Average Grant Date Fair Value              
Shares issued 32,632,150 32,632,150       17,351,446  
Increase (decrease) in share-based compensation $ 0            
Deferred offering costs incurred   $ 500 $ 100        
Deferred offering costs $ 280 $ 280       $ 216  
Second Amended Plan              
Shareholders' Equity              
Number of shares available for future grant 700,000 700,000          
Weighted Average Grant Date Fair Value              
Number of shares available for future grant 700,000 700,000          
Restricted shares              
Number of Shares              
Unvested at the beginning of the period (in shares)   189,000 145,000        
Granted (in shares)   205,000 119,000        
Vested (in shares)   (108,000) (70,000)        
Forfeited (in shares)   (7,000) (5,000)        
Unvested at the end of the period (in shares) 279,000 279,000 189,000        
Weighted Average Grant Date Fair Value              
Unvested at the beginning of the period (in dollars per share)   $ 11.98 $ 13.87        
Granted (in dollars per share)   11.30 10.78        
Vested (in dollars per share)   12.84 13.96        
Forfeited (in dollars per share)   10.97 11.09        
Unvested at the end of the period (in dollars per share) $ 11.16 $ 11.16 $ 11.97        
Share-based compensation expense   $ 1,100 $ 900        
Total unrecognized compensation costs related to non-vested stock awards $ 2,400 $ 2,400       $ 1,200  
Weighted average period over which unrecognized compensation costs is expected to be recognized   1 year 3 months 18 days          
Restricted shares | Second Amended Plan              
Shareholders' Equity              
Number of shares available for future grant       750,000      
Weighted Average Grant Date Fair Value              
Maximum shares of common stock to be issued       1,265,851 615,070    
Shares issued       529,195      
Number of shares available for future grant       750,000      
Common stock              
Weighted Average Grant Date Fair Value              
Shares issued 0 0 844,207        
Stock offering, maximum sales value             $ 25,000
Proceeds from issuance of common stock     $ 9,300        
Sale of common stock, weighted-average price per share     $ 11.06