Commitments and Contingencies - Additional Information (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Commitments And Contingencies [Line Items]
Letters of credit outstanding	$ 30,900,000	$ 31,800,000
Letters of credit expiration year	2030
Indemnification liabilities	$ 0
Manufacturing
Commitments And Contingencies [Line Items]
Purchase commitments for inventory and license	226,800,000
Manufacturing | Accrued Liabilities
Commitments And Contingencies [Line Items]
Loss on purchase obligation for inventory		300,000
Content License | Accrued Liabilities
Commitments And Contingencies [Line Items]
Purchase commitments for inventory and license	4,000,000.0	$ 1,700,000
Content Publishers
Commitments And Contingencies [Line Items]
Purchase commitments for inventory and license	$ 44,600,000