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Share Based Compensation - Special Equity Grant (Details)
12 Months Ended
Nov. 13, 2019
USD ($)
D
May 19, 2017
$ / shares
Dec. 31, 2019
Minimum      
Share Based Compensation      
Vesting period (in years)     1 year
Maximum      
Share Based Compensation      
Vesting period (in years)     4 years
Special Equity Plan | Performance-based stock awards      
Share Based Compensation      
Vesting (in percent)   100.00%  
Vesting period (in years)   3 years  
Compounded annual growth rate goal (in percent)   20.00%  
Equivalent share price at target date (in dollar per unit)   $ 22.07  
Share closing price on the eve of grant (in dollar per unit)   12.77  
Fair value (in dollars per unit)   $ 19.29  
Volatility rate   109.50%  
Risk-free interest rate   1.44%  
Performance period   3 years  
Number of trading days | D 25    
Performance Period 3 years    
Incremental fair value | $ $ 34,000    
Special Equity Plan | Performance-based stock awards | CAGR of 10% | Minimum      
Share Based Compensation      
Vesting (in percent)   50.00%  
Compounded annual growth rate goal (in percent)   10.00%  
Equivalent share price at target date (in dollar per unit)   $ 17.00  
Special Equity Plan | Performance-based stock awards | CAGR of 30% | Maximum      
Share Based Compensation      
Vesting (in percent)   200.00%  
Compounded annual growth rate goal (in percent)   30.00%  
Equivalent share price at target date (in dollar per unit)   $ 28.06