Balance Sheet Account Detail (Property and Equipment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 37,085		$ 37,085		$ 36,210
Accumulated depreciation	(16,878)		(16,878)		(12,945)
Property and equipment, net	20,207		20,207		23,265
Depreciation expense	1,200	$ 1,300	3,900	$ 3,900
Production equipment, molds, and office furniture
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	12,177		12,177		11,714
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	8,726		8,726		8,162
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	15,495		15,495		15,495
Construction in progress (software and related implementation, production equipment, and leasehold improvements)
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 687		$ 687		$ 839