Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Accounting Policies [Line Items]
Right-of-use asset	$ 7,000,000.0
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Prepaid Expense and Other Assets, Noncurrent
Operating Lease, Liability	$ 9,000,000.0
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	us-gaap:OtherLiabilitiesNoncurrent
Money Market Funds [Member]
Accounting Policies [Line Items]
Money market funds	$ 73,800,000	$ 52,300,000
Gain loss on securities unrealized	$ 0	$ 0