Segment Information - Reconciliation of U.S. GAAP (Loss) Income Before Income Taxes to Adjusted EBITDA (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting [Abstract]
Adjusted EBITDA	$ 46,590,000	$ 36,960,000
Stock-based compensation expense	(18,614,000)	(9,648,000)
Interest expense	(585,000)	(2,973,000)
Depreciation and amortization	(7,686,000)	(6,686,000)
Restructuring expense	0	(3,346,000)
Special adjustments, interest income and other	(1,647,000)	94,000
Income before income taxes	$ 18,058,000	$ 14,401,000