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Income Taxes (Reconciliation Of Gross Unrecognized Tax Benefits) (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Tax Expense (Benefit), Continuing Operations [Abstract]    
Gross unrecognized tax benefits at January 1 $ 220,682 $ 220,280
Increases in tax positions for prior years 3,699 119
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions (144) (71)
Increases in tax positions for current year 395 354
Gross unrecognized tax benefits at December 31 223,216 220,682
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities $ (1,416) $ 0