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Share-Based Compensation - Schedule of restricted stock and RSU activity (Details) - $ / shares
1 Months Ended 12 Months Ended
Apr. 30, 2019
Oct. 31, 2018
Dec. 31, 2015
Dec. 31, 2019
Dec. 31, 2018
Restricted Stock Units          
Number of Shares of Restricted Stock          
Outstanding, beginning balance (in shares)       0  
Granted (in shares)       173,196  
Vested (in shares)       (23,552)  
Cancelled/Forfeited (in shares)       (640)  
Outstanding, ending balance (in shares)       149,004 0
Weighted Average Grant Date Fair Value Per Share          
Weighted Average Grant Date Fair Value Per Share, Beginning balance (in dollars per share)       $ 0  
Weighted Average Grant Date Fair Value Per Share, Granted (in dollars per share)       126.29  
Weighted Average Grant Date Fair Value Per Share, Vested (in dollars per share)       84.84  
Weighted Average Grant Date Fair Value Per Share, Cancelled/Forfeited (in dollars per share)       0  
Weighted Average Grant Date Fair Value Per Share, Ending balance (in dollars per share)       $ 132.73 $ 0
Restricted Stock          
Number of Shares of Restricted Stock          
Outstanding, beginning balance (in shares)       100,127 0
Granted (in shares) 99,433 135,791 1,006,658 99,433 135,791
Vested (in shares)       (87,239) (35,664)
Cancelled/Forfeited (in shares)       (23,333) 0
Outstanding, ending balance (in shares)       88,988 100,127
Weighted Average Remaining Contractual Life (Years)          
Weighted Average Remaining Contractual Life, Unvested (Years)       1 year 2 months 12 days 1 year 7 months 6 days
Weighted Average Grant Date Fair Value Per Share          
Weighted Average Grant Date Fair Value Per Share, Beginning balance (in dollars per share)       $ 17.03 $ 0
Weighted Average Grant Date Fair Value Per Share, Granted (in dollars per share) $ 20.02     20.02 17.03
Weighted Average Grant Date Fair Value Per Share, Vested (in dollars per share)       19.21 17.03
Weighted Average Grant Date Fair Value Per Share, Cancelled/Forfeited (in dollars per share)       0 0
Weighted Average Grant Date Fair Value Per Share, Ending balance (in dollars per share)   $ 17.03   $ 19.49 $ 17.03