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Significant Components of Deferred Tax Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Income Tax Disclosure [Abstract] |  |  |  |
Net operating loss carryforwards | $ 10,630 | $ 11,385 |  |
Share-based compensation | 292 | 292 |  |
Investments | 131 | 131 |  |
Lease right-of-use assets | 6 | 6 |  |
Other | 5 | 66 |  |
Deferred Tax Assets, Gross, Total | 11,064 | 11,880 |  |
Less: valuation allowance | $ (11,064) | $ (11,880) | $ (13,607) | $ (13,046)

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