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Related Parties and Variable Interest Entity - Additional Information (Details)	1 Months Ended	3 Months Ended			9 Months Ended
	Nov. 30, 2020 shares	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) shares	Sep. 30, 2023 USD ($)	Feb. 29, 2024	Dec. 31, 2023 USD ($)	Feb. 28, 2023 USD ($)
Related Parties And Variable Interest Entity [Line Items]
Operating lease expense					$ 8,013,000	$ 9,210,000
Income from Sublease		$ 100,000		$ 200,000	$ 300,000	500,000
loan Issued								$ 400,000
Variable interest management fee					1
Dividend			$ 17,300,000
NAVER \| Private Placement \| Common Stock
Related Parties And Variable Interest Entity [Line Items]
Shares of common stock \| shares					2,380,952
Aggregate purchase price					$ 50,000,000
Related Parties \| NAVER
Related Parties And Variable Interest Entity [Line Items]
loan Issued									$ 11,600,000
Fixed interest pecentage							4.60%		5.26%
Dividend					16,600,000
Related Parties \| NAVER \| Leasing Office Space
Related Parties And Variable Interest Entity [Line Items]
Operating lease expense		1,600,000		1,600,000	4,600,000	4,700,000
Lease obligation		3,100,000			3,100,000			$ 21,300,000
Income from Sublease		100,000		200,000	200,000	500,000
Non-Employee Director \| Stock Options [Member]
Related Parties And Variable Interest Entity [Line Items]
Stock options exchange for non-director services \| shares	2,832,270
eBOOK Initiative Japan Co., Ltd.
Related Parties And Variable Interest Entity [Line Items]
Total gross reimbursement costs received		4,700,000		0	16,800,000	0
eBOOK Initiative Japan Co., Ltd. \| Cost of Revenue
Related Parties And Variable Interest Entity [Line Items]
Total gross reimbursement costs received		2,600,000		0	10,200,000	0
eBOOK Initiative Japan Co., Ltd. \| Marketing
Related Parties And Variable Interest Entity [Line Items]
Total gross reimbursement costs received		1,800,000		0	5,300,000	0
eBOOK Initiative Japan Co., Ltd. \| General and Administrative Expenses
Related Parties And Variable Interest Entity [Line Items]
Total gross reimbursement costs received		$ 300,000		$ 0	$ 1,200,000	$ 0