Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Commitments And Contingencies [Line Items]
Letters of credit outstanding	$ 3.1		$ 3.1		$ 1.5
Letters of credit expiration date			Dec. 31, 2019
Player | Cost of Revenue
Commitments And Contingencies [Line Items]
Reversal of loss contingencies accrual	8.9		$ 8.9
Intellectual Property Licensing
Commitments And Contingencies [Line Items]
Loss contingencies accrual, chnage in estimated liabilitites	8.9
Manufacturing
Commitments And Contingencies [Line Items]
Purchase commitments for inventory	104.0		104.0
Manufacturing | Accrued Liabilities
Commitments And Contingencies [Line Items]
Loss on purchase obligation for inventory			0.2		$ 0.6
Content License
Commitments And Contingencies [Line Items]
Purchase obligation that do not yet Meet criteria for asset recognition	0.2		0.2
Content License | Accrued Liabilities
Commitments And Contingencies [Line Items]
Purchase commitments for inventory	0.1		0.1
Office Space
Commitments And Contingencies [Line Items]
Rent expense	$ 2.4	$ 1.6	$ 4.6	$ 3.1
Operating lease latest expiration date			Nov. 30, 2024