Revenue - Percentage of Net Sales (Details) - Revenue from Contract with Customer	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Distribution Channel Concentration Risk | Indirect channel
Disaggregation of Revenue [Line Items]
Percentage of sales	87.00%	79.00%
Distribution Channel Concentration Risk | Website
Disaggregation of Revenue [Line Items]
Percentage of sales	8.00%	14.00%
Distribution Channel Concentration Risk | Franchisees
Disaggregation of Revenue [Line Items]
Percentage of sales	5.00%	7.00%
Geographic Concentration Risk | United States
Disaggregation of Revenue [Line Items]
Percentage of sales	77.00%	71.00%
Geographic Concentration Risk | Europe
Disaggregation of Revenue [Line Items]
Percentage of sales	14.00%	12.00%
Geographic Concentration Risk | Other
Disaggregation of Revenue [Line Items]
Percentage of sales	9.00%	17.00%
Protection (screen protection and cases) | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of sales	67.00%	59.00%
Power (power management and power cases) | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of sales	25.00%	29.00%
Audio | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of sales	2.00%	5.00%
Productivity (keyboards and other) | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of sales	6.00%	7.00%