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Earnings (Loss) per Share - Antidilutive Securities (Details) - shares
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Employee Stock Option [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 2,310,485 2,208,228
Unvested Restricted Stock Units [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 678,687 164,623