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Employee and Consultant Equity-Based Compensation - RSU and SG Activity (Details) - RSU's and SG's - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of Shares      
Beginning balance (shares) 24,150 40,250  
Granted (shares) 76,000 1,911  
Forfeited (shares) 0 0  
Vested/Released (shares) (24,150) (18,011)  
Ending balance (shares) 76,000 24,150 40,250
Weighted Average Grant Date Fair Value per Share      
Beginning balance (dollars per share) $ 20.91 $ 20.91  
Granted (dollars per share) 17.33 22.40 $ 0.00
Forfeited (dollars per share) 0.00 0.00  
Vested/released (dollars per share) 16.58 21.07  
Ending balance (dollars per share) $ 18.70 $ 20.91 $ 20.91