Description of Business and Summary of Significant Accounting Policies (Capitalized Contract Costs) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Deferred Contract Costs [Roll Forward]
Capitalized Contract Cost, Net, beginning of period	$ 2,401
Capitalized Contract Cost, Amortization	(898)
Capitalized Contract Costs, net additions	735
Capitalized Contract Cost, Net, end of period	2,238
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Deferred Contract Costs [Roll Forward]
Capitalized Contract Cost, Net, beginning of period	0
Accounting Standards Update 2014-09 Adjustments | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Deferred Contract Costs [Roll Forward]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Capitalized Contract Costs	$ 2,401