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Summary of Significant Accounting Policies - Anti-dilutive weighted average diluted common shares (Details) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 2,297,793 2,241,033
Restricted Stock Units (RSUs) [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 60,355 20,165
Options [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 2,237,438 2,220,868