Investments - Schedule of Fair Value of Cash Equivalents, Long and Short Term Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Amortized Cost
Schedule Of Investments [Line Items]
Total cash equivalents and investments	$ 247,593	$ 122,418
Less: cash equivalents	(41,582)	(58,644)
Total Investments	206,011	63,774
Amortized Cost | Money Market Funds | Fair Value, Inputs, Level 1
Schedule Of Investments [Line Items]
Total cash equivalents and investments	31,298	69,611
Amortized Cost | Commercial Bonds and Paper | Fair Value, Inputs, Level 2
Schedule Of Investments [Line Items]
Total cash equivalents and investments	57,477	43,251
Amortized Cost | U.S. Treasury Securities | Fair Value, Inputs, Level 2
Schedule Of Investments [Line Items]
Total cash equivalents and investments	158,818	9,556
Gross Unrealized Holding Gains
Schedule Of Investments [Line Items]
Total cash equivalents and investments	968	191
Total Investments	968	191
Gross Unrealized Holding Gains | Commercial Bonds and Paper | Fair Value, Inputs, Level 2
Schedule Of Investments [Line Items]
Total cash equivalents and investments	268	135
Gross Unrealized Holding Gains | U.S. Treasury Securities | Fair Value, Inputs, Level 2
Schedule Of Investments [Line Items]
Total cash equivalents and investments	700	56
Gross Unrealized Holding Losses
Schedule Of Investments [Line Items]
Total cash equivalents and investments	(14)	(38)
Total Investments	(14)	(38)
Gross Unrealized Holding Losses | Commercial Bonds and Paper | Fair Value, Inputs, Level 2
Schedule Of Investments [Line Items]
Total cash equivalents and investments	(12)	(38)
Gross Unrealized Holding Losses | U.S. Treasury Securities | Fair Value, Inputs, Level 2
Schedule Of Investments [Line Items]
Total cash equivalents and investments	(2)
Estimated Fair Value
Schedule Of Investments [Line Items]
Total cash equivalents and investments	248,547	122,571
Less: cash equivalents	(41,582)	(58,644)
Total Investments	206,965	63,927
Estimated Fair Value | Money Market Funds | Fair Value, Inputs, Level 1
Schedule Of Investments [Line Items]
Total cash equivalents and investments	31,298	69,611
Estimated Fair Value | Commercial Bonds and Paper | Fair Value, Inputs, Level 2
Schedule Of Investments [Line Items]
Total cash equivalents and investments	57,733	43,348
Estimated Fair Value | U.S. Treasury Securities | Fair Value, Inputs, Level 2
Schedule Of Investments [Line Items]
Total cash equivalents and investments	$ 159,516	$ 9,612