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Stockholders' Equity - Antidilutive Securities Excluded from Computation of Net Income Per Share (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Restricted stock units        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities $ 107,139 $ 0 $ 162,648 $ 0