Significant Accounting Policies - Estimated Fair Value of Assets and Liability (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Asset:
Asset, fair value	$ 216,587	$ 247,178
U.S. Treasury Securities
Asset:
Asset, fair value	172,822	174,722
Money Market Fund
Asset:
Asset, fair value	38,765	67,456
Repo Securities
Asset:
Asset, fair value	5,000	5,000
Level 1
Asset:
Asset, fair value	211,587	242,178
Level 1 | U.S. Treasury Securities
Asset:
Asset, fair value	172,822	174,722
Level 1 | Money Market Fund
Asset:
Asset, fair value	38,765	67,456
Level 2
Asset:
Asset, fair value	5,000	5,000
Level 2 | Repo Securities
Asset:
Asset, fair value	$ 5,000	$ 5,000