Fair Value Measurements and Marketable Equity Securities - Schedule of Portion of Unrealized Gains and Losses Relate to Marketable Equity Securities (Detail) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Gain (Loss) on Securities [Line Items] | ||||
| Net (gain) loss during the period on marketable equity securities | $ (42,773) | $ 1,276 | $ (108,939) | $ (4,731) |
| Less: Net gain recognized during the period on marketable equity securities sold during the period | 0 | 0 | 0 | (3,264) |
| Unrealized (gain) loss recognized during the period on marketable equity securities still held at the reporting date | $ (42,773) | $ 1,276 | $ (108,939) | $ (1,467) |