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Significant Components of Deferred Tax Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Income Tax Disclosure [Abstract] |  |  |  |
Net operating loss carryforwards | $ 13,079 | $ 12,519 |  |
Share-based compensation | 324 | 315 |  |
Investments | 145 | 141 |  |
Lease right-of-use assets | 4 | 19 |  |
Intangible assets and goodwill | 1 | 2 |  |
Other | 54 | 50 |  |
Deferred Tax Assets, Gross, Total | 13,607 | 13,046 |  |
Less: valuation allowance | $ (13,607) | $ (13,046) | $ (12,732) | $ (11,765)

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