Cash, Cash Equivalents, Restricted Cash And Investments - Summary of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value (Detail) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items]
Less than 12 Months, Fair Value	$ 343,300,000
Less than 12 Months, Gross Unrealized Losses	(2,073,000)
12 Months or Longer, Fair value	141,421,000	$ 0
12 Months or Longer, Gross Unrealized Losses	(4,015,000)
Total, Fair value	484,721,000
Total, Gross Unrealized Loses	(6,088,000)
Commercial Paper [Member]
Debt Securities, Available-for-Sale [Line Items]
Less than 12 Months, Fair Value	81,043,000
Less than 12 Months, Gross Unrealized Losses	(150,000)
Total, Fair value	81,043,000
Total, Gross Unrealized Loses	(150,000)
Corporate Notes and Bonds [Member]
Debt Securities, Available-for-Sale [Line Items]
Less than 12 Months, Fair Value	88,890,000
Less than 12 Months, Gross Unrealized Losses	(1,071,000)
12 Months or Longer, Fair value	127,464,000
12 Months or Longer, Gross Unrealized Losses	(3,511,000)
Total, Fair value	216,354,000
Total, Gross Unrealized Loses	(4,582,000)
Municipal Bonds [Member]
Debt Securities, Available-for-Sale [Line Items]
12 Months or Longer, Fair value	4,804,000
12 Months or Longer, Gross Unrealized Losses	(162,000)
Total, Fair value	4,804,000
Total, Gross Unrealized Loses	(162,000)
US government and agency
Debt Securities, Available-for-Sale [Line Items]
Less than 12 Months, Fair Value	173,367,000
Less than 12 Months, Gross Unrealized Losses	(852,000)
12 Months or Longer, Fair value	9,153,000
12 Months or Longer, Gross Unrealized Losses	(342,000)
Total, Fair value	182,520,000
Total, Gross Unrealized Loses	$ (1,194,000)