Revenue - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Revenue	[1]	$ 320,972	$ 320,663	$ 647,716	$ 630,920
Customer liability revenue recognized during the period		65,800	50,100	67,800	54,900
Paid Content
Disaggregation of Revenue [Line Items]
Revenue		260,709	258,129	527,564	513,821
Paid Content | Physical Book Sales Through Platform
Disaggregation of Revenue [Line Items]
Revenue		2,500	1,800	5,200	3,800
IP Adaptations
Disaggregation of Revenue [Line Items]
Revenue		19,844	20,596	42,737	44,649
IP Adaptations | Licensing Agreements
Disaggregation of Revenue [Line Items]
Revenue		3,600	2,800	6,800	6,000
IP Adaptations | Merchandise Sales
Disaggregation of Revenue [Line Items]
Revenue		$ 3,400	$ 2,100	$ 8,800	$ 3,400

[1] Includes amounts earned from related parties of $20,880 and $27,663 for the three months ended June 30, 2024 and June 30, 2023, respectively and $34,167 and $46,774 for the six months ended June 30, 2024 and June 30, 2023, respectively. (See Note 13. Related Parties and Variable Interest Entity)