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Earnings Per Share - Anti-dilutive Securities Excluded (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Employee Stock Option | Warrant        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Stock options and warrants (in shares) 8,469,440 4,491,024 8,419,375 4,491,024