Significant Accounting Policies - Estimated Fair Value of Assets and Liability (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Asset:
Asset, fair value	$ 229,153	$ 192,307
Money Market Fund
Asset:
Asset, fair value	136,995	81,870
Commercial Paper
Asset:
Asset, fair value	65,660	62,347
Agency Securities
Asset:
Asset, fair value	12,258	1,554
Certificates of Deposit
Asset:
Asset, fair value	4,099	9,100
Corporate Bonds
Asset:
Asset, fair value	3,610	28,416
Repo Securities
Asset:
Asset, fair value	3,250	3,250
U.S. Treasury Securities
Asset:
Asset, fair value	3,185	3,117
Asset Backed Securities
Asset:
Asset, fair value	96	1,260
Non-US Government
Asset:
Asset, fair value		1,393
Level 1
Asset:
Asset, fair value	142,604	86,541
Level 1 | Money Market Fund
Asset:
Asset, fair value	136,995	81,870
Level 1 | Agency Securities
Asset:
Asset, fair value	2,424	1,554
Level 1 | U.S. Treasury Securities
Asset:
Asset, fair value	3,185	3,117
Level 2
Asset:
Asset, fair value	86,549	105,766
Level 2 | Commercial Paper
Asset:
Asset, fair value	65,660	62,347
Level 2 | Agency Securities
Asset:
Asset, fair value	9,834
Level 2 | Certificates of Deposit
Asset:
Asset, fair value	4,099	9,100
Level 2 | Corporate Bonds
Asset:
Asset, fair value	3,610	28,416
Level 2 | Repo Securities
Asset:
Asset, fair value	3,250	3,250
Level 2 | Asset Backed Securities
Asset:
Asset, fair value	$ 96	1,260
Level 2 | Non-US Government
Asset:
Asset, fair value		$ 1,393