Investments - Schedule of Fair Value of Cash Equivalents, Long and Short Term Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Amortized Cost
Schedule Of Investments [Line Items]
Total cash equivalents and investments	$ 129,887	$ 154,823
Less cash equivalents	68,616	51,783
Total Investments	(61,271)	(103,040)
Amortized Cost | Commercial Bonds and Paper | Fair Value, Inputs, Level 2
Schedule Of Investments [Line Items]
Total cash equivalents and investments	50,247	66,762
Amortized Cost | Money Market Funds | Fair Value, Inputs, Level 1
Schedule Of Investments [Line Items]
Total cash equivalents and investments	70,647	51,783
Amortized Cost | U.S. Treasuries | Fair Value, Inputs, Level 2
Schedule Of Investments [Line Items]
Total cash equivalents and investments	8,993	36,278
Gross Unrealized Holding Gains (Losses)
Schedule Of Investments [Line Items]
Total cash equivalents and investments	(26)	(1,181)
Total Investments	(26)	(1,181)
Gross Unrealized Holding Gains (Losses) | Commercial Bonds and Paper | Fair Value, Inputs, Level 2
Schedule Of Investments [Line Items]
Total cash equivalents and investments	(1)	(594)
Gross Unrealized Holding Gains (Losses) | Money Market Funds | Fair Value, Inputs, Level 1
Schedule Of Investments [Line Items]
Total cash equivalents and investments	1
Gross Unrealized Holding Gains (Losses) | U.S. Treasuries | Fair Value, Inputs, Level 2
Schedule Of Investments [Line Items]
Total cash equivalents and investments	(26)	(587)
Estimated Fair Value
Schedule Of Investments [Line Items]
Total cash equivalents and investments	129,861	153,642
Less cash equivalents	68,616	51,783
Total Investments	(61,245)	(101,859)
Estimated Fair Value | Commercial Bonds and Paper | Fair Value, Inputs, Level 2
Schedule Of Investments [Line Items]
Total cash equivalents and investments	50,246	66,168
Estimated Fair Value | Money Market Funds | Fair Value, Inputs, Level 1
Schedule Of Investments [Line Items]
Total cash equivalents and investments	70,648	51,783
Estimated Fair Value | U.S. Treasuries | Fair Value, Inputs, Level 2
Schedule Of Investments [Line Items]
Total cash equivalents and investments	$ 8,967	$ 35,691