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Earnings Per Share - Additional Information (Details) - shares
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Options [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Securities excluded from the diluted earnings per share computation (in shares) 6,067 9,541
Warrant [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Securities excluded from the diluted earnings per share computation (in shares)   519,241