Commitments and Contingencies - Additional Information (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($)	Oct. 01, 2016 USD ($)	Sep. 30, 2017 USD ($) Vendor	Oct. 01, 2016 USD ($)	Dec. 31, 2016 USD ($)
Commitments And Contingencies [Line Items]
Rent expense	$ 1,716,000	$ 1,122,000	$ 4,805,000	$ 3,505,000
Letters of credit outstanding	1,472,000		$ 1,472,000		$ 868,000
Minimum
Commitments And Contingencies [Line Items]
Letters of credit expiration date			Jan. 31, 2018
Maximum
Commitments And Contingencies [Line Items]
Letters of credit expiration date			Aug. 31, 2018
Manufacturing
Commitments And Contingencies [Line Items]
Number of vendors having purchase commitments | Vendor			1
Purchase commitments for inventory	87,151,000		$ 87,151,000
Manufacturing | Accrued Liabilities
Commitments And Contingencies [Line Items]
Loss on purchase obligation for inventory			1,366,000		2,040,000
Content License
Commitments And Contingencies [Line Items]
Purchase obligation that do not yet Meet criteria for asset recognition	1,611,000		1,611,000
Content License | Accrued Liabilities
Commitments And Contingencies [Line Items]
Purchase commitments for inventory	$ 506,000		$ 506,000		$ 0
Player | Minimum
Commitments And Contingencies [Line Items]
Product Warranty Term			12 months
Player | Maximum
Commitments And Contingencies [Line Items]
Product Warranty Term			24 months