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Share-Based Compensation - Schedule of restricted stock and RSU activity (Details) - $ / shares
1 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2019
Oct. 31, 2018
Sep. 28, 2019
Dec. 31, 2018
Restricted Stock Unit        
Number of Shares of Restricted Stock        
Outstanding, beginning balance (in shares)     0  
Granted (in shares)     85,222  
Vested (in shares)     (101)  
Outstanding, ending balance (in shares)     85,121 0
Weighted Average Grant Date Fair Value Per Share        
Weighted Average Grant Date Fair Value Per Share (in dollars per share)     $ 169.49 $ 0
Weighted Average Grant Date Fair Value Per Share, Granted (in dollars per share)     169.48  
Weighted Average Grant Date Fair Value Per Share, Vested (in dollars per share)     $ 176.04  
Restricted Stock        
Number of Shares of Restricted Stock        
Outstanding, beginning balance (in shares)     100,127  
Granted (in shares) 99,433 135,791 99,433  
Vested (in shares)     (62,626)  
Cancelled/Forfeited (in shares)     (23,333)  
Outstanding, ending balance (in shares)     113,601 100,127
Weighted Average Remaining Contractual Life (Years)        
Weighted Average Remaining Contractual Life, Unvested (Years)     1 year 6 months 1 year 7 months 6 days
Weighted Average Grant Date Fair Value Per Share        
Weighted Average Grant Date Fair Value Per Share (in dollars per share)   $ 17.03 $ 19.49 $ 17.03
Weighted Average Grant Date Fair Value Per Share, Granted (in dollars per share) $ 20.02   20.02  
Weighted Average Grant Date Fair Value Per Share, Vested (in dollars per share)     19.21  
Weighted Average Grant Date Fair Value Per Share, Forfeited (in dollars per share)     $ 0