Lease Obligations - Additional Information (Detail) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) ft²	Dec. 31, 2021 USD ($)	Nov. 30, 2021 ft²
Lessee Lease Description [Line Items]
Option to extend		true
Right-of-use assets		$ 99.5	$ 75.7
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]		Other assets	Other assets
Lease liability, current		$ 7.8	$ 3.6
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]		Accrued expenses and other current liabilities	Accrued expenses and other current liabilities
Lease liability, noncurrent		$ 114.3	$ 93.8
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]		Other long-term liabilities	Other long-term liabilities
Rent expense	$ 12.6		$ 9.6
Weighted-average discount rate		4.40%
Weighted-average remaining lease term		13 years 3 months 21 days
Rockville Maryland Office [Member]
Lessee Lease Description [Line Items]
Approximate square feet of office space | ft²		42,000		192,000
South San Francisco Office [Member]
Lessee Lease Description [Line Items]
Approximate square feet of office space | ft²		40,000
Lease expiry date		Dec. 31, 2031
Lake Forest Office [Member]
Lessee Lease Description [Line Items]
Approximate square feet of office space | ft²		160,000
Lease expiry date	Mar. 31, 2031	Mar. 31, 2031
Impairment charge			$ 12.4
Sublease agreement entered date	2022-01