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Earnings (Loss) Per Share - Schedule of Potentially Dilutive Securities (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Potentially dilutive securities 2,153,952 1,794,099 2,220,147
Service Period Stock Options      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Potentially dilutive securities 1,932,268 1,535,762 2,009,372
Restricted Stock Units      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Potentially dilutive securities 208,402 234,091 197,492
Performance Shares      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Potentially dilutive securities 13,283 24,246 13,283