Use of Estimates and Summary of Significant Accounting Policies (Property and Equipment, Useful Lives) (Details)	12 Months Ended
	Dec. 31, 2017
Office furniture
Property, Plant and Equipment [Line Items]
Property and equipment useful life	7 years
Computer hardware
Property, Plant and Equipment [Line Items]
Property and equipment useful life	3 years
Computer software | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment useful life	3 years
Computer software | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment useful life	8 years
Production equipment and molds | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment useful life	3 years
Production equipment and molds | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment useful life	7 years