Investments - Schedule of Investments by Security Type (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 111,258	$ 187,439
Gross Unrealized Gain		14
Gross Unrealized Loss	(59)	(61)
Fair Value	111,199	187,392
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,250	12,343
Fair Value	6,250	12,343
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	40,123	68,333
Gross Unrealized Gain		8
Gross Unrealized Loss	(28)	(52)
Fair Value	40,095	68,289
Certificate of Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2,272
Fair Value		2,272
Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	64,885	104,491
Gross Unrealized Gain		6
Gross Unrealized Loss	(31)	(9)
Fair Value	$ 64,854	$ 104,488