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Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
Income Taxes (Narrative) (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
Excess tax benefit, share-based compensation	$ 400,000	$ 15,800,000
Revaluation charge of DTAs	300,000
Unrecognized tax benefits	5,578,000	5,078,000	$ 4,765,000	$ 4,429,000
Interest or penalties recognized related to unrecognized tax benefits	0	$ 0	$ 0
State income tax net operating loss carry forwards	$ 6,500,000
Percentage over lowest ownership percentage to determine ownership change	50.00%
Testing period for ownership change	3 years
Federal
Income Taxes [Line Items]
Research and development carryforwards amount	$ 700,000
State
Income Taxes [Line Items]
Research and development carryforwards amount	$ 4,400,000