Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2017
Accounting Policies [Line Items]
Impairment losses	$ 0	$ 0	$ 0
Impairment charge of indefinite-lived intangible assets	0
Income tax receivable, current	9,388,000	6,736,000
Advertising expenses	$ 4,300,000	$ 4,000,000.0	$ 4,500,000
Shares issued		133,336
Remaining mezzanine equity	66,664
ASU 2019-12
Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2021
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true
ASU 2021-08
Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2021
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true
Restricted Stock Units (RSUs) [Member]
Accounting Policies [Line Items]
Stock-based compensation awards requisite service period	4 years
Class A Common Stock [Member] | Put Option [Member]
Accounting Policies [Line Items]
Put right exercise period from date of purchase				5 years
Shares issued				200,000
Put right, exercise price				$ 12.50
Ministry of the Economy, Finance and Industry, France [Member] | Research and Development Tax Credit Carryforward [Member]
Accounting Policies [Line Items]
Tax credit carryforward, period	3 years
Income tax receivable	$ 12,000,000.0	$ 13,200,000
Income tax receivable, current	3,500,000	3,200,000
Income tax receivable, noncurrent	$ 8,500,000	$ 10,000,000.0
Building and Improvements [Member] | Minimum [Member]
Accounting Policies [Line Items]
Property and equipment, estimated useful life	5 years
Building and Improvements [Member] | Maximum [Member]
Accounting Policies [Line Items]
Property and equipment, estimated useful life	39 years
Computer Equipment and Software [Member] | Minimum [Member]
Accounting Policies [Line Items]
Property and equipment, estimated useful life	3 years
Computer Equipment and Software [Member] | Maximum [Member]
Accounting Policies [Line Items]
Property and equipment, estimated useful life	5 years
Office Furniture and Equipment [Member] | Minimum [Member]
Accounting Policies [Line Items]
Property and equipment, estimated useful life	5 years
Office Furniture and Equipment [Member] | Maximum [Member]
Accounting Policies [Line Items]
Property and equipment, estimated useful life	15 years