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Income Taxes - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Line Items]        
Federal income tax rate   34.00% 34.00% 34.00%
Income tax expense due to enactment of statutory tax rate   $ 2,113,000    
Maximum measurement period to finalize accounting of tax   1 year    
Maximum limit on deduction for certain employees compensation under Internal Revenue Code Section 162(m)   $ 1,000,000    
NEW YORK        
Income Taxes [Line Items]        
Unrecognized tax benefits   $ 0 $ 0  
Scenario Forecast        
Income Taxes [Line Items]        
Federal income tax rate 21.00%