Short-term Investments - Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 84,871	$ 242,140
Gross unrealized gains	0	5
Gross unrealized losses	(589)	(324)
Fair value	84,282	241,821
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	14,220
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(68)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	66,061
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(521)
Debt Securities, Available-for-sale, Unrealized Loss Position	80,281
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(589)
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	62,862	177,375
Gross unrealized gains	0	3
Gross unrealized losses	(359)	(195)
Fair value	62,503	177,183
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	10,232
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(52)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	48,271
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(307)
Debt Securities, Available-for-sale, Unrealized Loss Position	58,503
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(359)
U.S. government-related debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	22,009	33,134
Gross unrealized gains	0	2
Gross unrealized losses	(230)	(97)
Fair value	21,779	33,039
Asset-backed Securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost		31,631
Gross unrealized gains		0
Gross unrealized losses		(32)
Fair value		$ 31,599
US Government Debt Securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	3,988
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(16)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	17,790
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(214)
Debt Securities, Available-for-sale, Unrealized Loss Position	21,778
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ (230)

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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