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Equity Based Compensation - Schedule of Information about Equity Incentive Plan Activity (Details) - 2018 Equity Incentive Plan
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unvested restricted common stock, Granted 737,658
Restricted Stock Awards  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unvested restricted common stock outstanding, Beginning Balance 691,290
Unvested restricted common stock, Granted 46,368
Unvested restricted common stock outstanding, Ending Balance 737,658
Unvested restricted common stock outstanding, Weighted average grant date fair value | $ / shares $ 13.68
Unvested restricted common stock outstanding, Granted, Weighted average grant date fair value | $ / shares 14.12
Unvested restricted common stock outstanding, Weighted average grant date fair value | $ / shares $ 13.71
Restricted Stock Units  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unvested restricted common stock, Granted 89,314
Unvested restricted common stock outstanding, Ending Balance 89,314
Unvested restricted common stock outstanding, Granted, Weighted average grant date fair value | $ / shares $ 23.07
Unvested restricted common stock outstanding, Weighted average grant date fair value | $ / shares $ 23.07