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Share-based Compensation - Omnibus Incentive Plan (Details) - The 2018 Omnibus Incentive Plan [Member] - $ / shares
6 Months Ended
Jun. 30, 2020
May 31, 2020
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares reserved for future issuance, in shares   5,800,000 3,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Unvested, beginning balance (in shares) 908,088    
Granted, number of shares (in shares) 1,010,461    
Vested, number of shares (in shares) (209,627)    
Forfeited, number of shares (in shares) (55,952)    
Unvested, ending balance (in shares) 1,652,970    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Unvested, weighted average, beginning (in dollars per share) $ 8.73    
Granted, weighted average grant date fair value (in dollars per share) 5.01    
Vested, weighted average grant date fair value (in dollars per share) 9.06    
Forfeited, weighted average grant date fair value (in dollars per share) 6.84    
Unvested, weighted average, ending (in dollars per share) $ 6.48