Recent Accounting Standards - Additional Information (Detail) - USD ($)	Jan. 01, 2019	Dec. 31, 2021	Jan. 01, 2021	Dec. 31, 2020
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Retained earnings		$ 41,442,000		$ 575,965,000
Short-term investments		0		0
Right-of-use assets		66,760,000		$ 73,597,000
Operating lease liabilities, Total		$ 85,819,000
Minimum | US Treasury Securities
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Available-for-sale securities maturity range		3 months
Maximum | US Treasury Securities
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Available-for-sale securities maturity range		1 year
ASU 2019-12 | Revision of Prior Period, Change in Accounting Principle, Adjustment
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Retained earnings			$ 0
ASU 2016-13 | Revision of Prior Period, Change in Accounting Principle, Adjustment
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Retained earnings			$ 0
ASU 2016-02
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Retained earnings	$ 0
Right-of-use assets	88,800,000
Operating lease liabilities, Total	116,900,000
Reductions in deferred rent	28,500,000
Reductions in prepaid expenses	$ 400,000