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Stockholders' Equity and Non-controlling Interests - Summary of the non-vested Restricted Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
May 03, 2017
May 02, 2017
Weighted Average Grant Date Fair Value          
Shares issued 30,076,842   30,594,592    
Increase (decrease) in share-based compensation $ 0   $ 0    
Deferred offering costs incurred $ 0 $ 100      
Deferred offering costs     $ 218    
Second Amended Plan          
Shareholders' Equity          
Number of shares available for future grant 400,000        
Weighted Average Grant Date Fair Value          
Number of shares available for future grant 400,000        
Restricted Stock Awards          
Number of Shares          
Unvested at the beginning of the period (in shares) 299,000        
Granted (in shares) 224,000        
Vested (in shares) (167,000)        
Forfeited (in shares) (6,000)        
Unvested at the end of the period (in shares) 350,000   299,000    
Weighted Average Grant Date Fair Value          
Unvested at the beginning of the period (in dollars per share) $ 9.49        
Granted (in dollars per share) 6.06        
Vested (in dollars per share) 8.08        
Forfeited (in dollars per share) 7.19        
Unvested at the end of the period (in dollars per share) $ 7.64   $ 9.49    
Share-based compensation expense $ 1,300 $ 1,100      
Total unrecognized compensation costs related to non-vested stock awards $ 1,600   $ 1,600    
Weighted average period over which unrecognized compensation costs is expected to be recognized 1 year 10 months 17 days        
Restricted Stock Awards | Second Amended Plan          
Weighted Average Grant Date Fair Value          
Maximum shares of common stock to be issued       500,000  
Common stock | First Amended Plan          
Weighted Average Grant Date Fair Value          
Maximum shares of common stock to be issued         600,000
Common stock | Second Amended Plan          
Shareholders' Equity          
Number of shares available for future grant       800,000  
Weighted Average Grant Date Fair Value          
Maximum shares of common stock to be issued       1,300,000  
Number of shares available for future grant       800,000