Significant Accounting Policies - Estimated Fair Value of Assets and Liability (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Asset:
Asset, fair value	$ 196,417	$ 192,307
Agency Securities
Asset:
Asset, fair value	3,999	1,554
Money Market Fund
Asset:
Asset, fair value	80,105	81,870
U.S. Treasury Securities
Asset:
Asset, fair value	3,153	3,117
Corporate Bonds
Asset:
Asset, fair value	16,035	28,416
Commercial Paper
Asset:
Asset, fair value	79,440	62,347
Repo Securities
Asset:
Asset, fair value	3,250	3,250
Asset Backed Securities
Asset:
Asset, fair value	546	1,260
Certificates of Deposit
Asset:
Asset, fair value	8,490	9,100
Non-US Government
Asset:
Asset, fair value	1,399	1,393
Level 1
Asset:
Asset, fair value	87,257	86,541
Level 1 | Agency Securities
Asset:
Asset, fair value	3,999	1,554
Level 1 | Money Market Fund
Asset:
Asset, fair value	80,105	81,870
Level 1 | U.S. Treasury Securities
Asset:
Asset, fair value	3,153	3,117
Level 2
Asset:
Asset, fair value	109,160	105,766
Level 2 | Corporate Bonds
Asset:
Asset, fair value	16,035	28,416
Level 2 | Commercial Paper
Asset:
Asset, fair value	79,440	62,347
Level 2 | Repo Securities
Asset:
Asset, fair value	3,250	3,250
Level 2 | Asset Backed Securities
Asset:
Asset, fair value	546	1,260
Level 2 | Certificates of Deposit
Asset:
Asset, fair value	8,490	9,100
Level 2 | Non-US Government
Asset:
Asset, fair value	$ 1,399	$ 1,393