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Significant Components of Deferred Tax Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Income Tax Disclosure [Abstract] |  |  |  |
Net operating loss carryforwards | $ 12,519 | $ 12,005 |  |
Share-based compensation | 315 | 299 |  |
Investments | 141 | 134 |  |
Lease right-of-use assets | 19 | 122 |  |
Intangible assets and goodwill | 2 | 64 |  |
Other | 50 | 108 |  |
Deferred Tax Assets, Gross, Total | 13,046 | 12,732 |  |
Less: valuation allowance | $ (13,046) | $ (12,732) | $ (11,765) | $ (9,928)

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