The Company and Summary of Significant Accounting Policies Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 01, 2018	Jan. 01, 2017
Significant Accounting Policies [Line Items]
Goodwill impairment charges		$ 0	$ 0	$ 0
Impairment of Intangible Assets (Excluding Goodwill)		0	0	0
Shipping, Handling and Transportation Costs		9,400,000	9,200,000	10,400,000
Marketing and Advertising Expense		$ 33,300,000	24,500,000	19,400,000
Cumulative Effect of New Accounting Principle in Period of Adoption			$ 92,000
Minimum [Member]
Significant Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life		3 years
Standard Warranty Replacement of a Defective Product, Period		1 year
Maximum [Member]
Significant Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life		10 years
Accounts Receivable [Member] | Best Buy Inc [Member] | Customer Concentration Risk [Member]
Significant Accounting Policies [Line Items]
Concentration Risk, Percentage		35.00%	38.00%
Accounts Receivable [Member] | Amazon [Member] | Customer Concentration Risk [Member]
Significant Accounting Policies [Line Items]
Concentration Risk, Percentage		12.00%	11.00%
Retained Earnings [Member]
Significant Accounting Policies [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption			$ (235,000)
Accounting Standards Update 2016-09 [Member]
Significant Accounting Policies [Line Items]
Other Tax Expense (Benefit)		$ 2,700,000
Excess Tax Benefit from Share-based Compensation, Operating Activities			3,000,000	800,000
Excess Tax Benefit from Share-based Compensation, Financing Activities			$ 3,000,000	$ 800,000
Accounting Standards Update 2016-09 [Member] | Retained Earnings [Member]
Significant Accounting Policies [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption						$ (200,000)
Accounting Standards Update 2014-09 [Member] | Subsequent Event [Member] | Retained Earnings [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets					$ 10,000,000
Accounting Standards Update 2014-09 [Member] | Subsequent Event [Member] | Retained Earnings [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets					15,000,000
Accounting Standards Update 2016-16 [Member] | Subsequent Event [Member]
Significant Accounting Policies [Line Items]
Other Tax Expense (Benefit)	$ (700,000)
Accounting Standards Update 2016-16 [Member] | Subsequent Event [Member] | Retained Earnings [Member]
Significant Accounting Policies [Line Items]
Deferred Tax Assets, Other					$ 21,000,000