Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($) Customer	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) FinancialInstitution Customer	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) FinancialInstitution Customer	Jan. 01, 2020 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Restricted cash	$ 1,539	$ 868	$ 1,539	$ 868	$ 1,854
Content licensing expenses			8,900		1,700
Amortization of content license assets	6,100	$ 300	12,182	$ 760
Cumulative-effect adjustment to accumulated deficit	$ 412,659		$ 412,659		$ 313,833
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment | Revision of Prior Period, Adjustment
Summary Of Significant Accounting Policies [Line Items]
Cumulative-effect adjustment to accumulated deficit						$ 1,100
Customer Concentration Risk | Net Accounts Receivable
Summary Of Significant Accounting Policies [Line Items]
Number of customers accounted for 10% or more | Customer	0		0		0
Customer 1
Summary Of Significant Accounting Policies [Line Items]
Number of financial institutions which manage cash balances | FinancialInstitution			1		1
Customer 1 | Cash and Cash Equivalents
Summary Of Significant Accounting Policies [Line Items]
Percentage of cash and cash equivalents balances			52.00%		65.00%
Customer 2
Summary Of Significant Accounting Policies [Line Items]
Number of financial institutions which manage cash balances | FinancialInstitution			1		1
Customer 2 | Cash and Cash Equivalents
Summary Of Significant Accounting Policies [Line Items]
Percentage of cash and cash equivalents balances			25.00%		34.00%