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Other Current Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Other Assets [Abstract] |  |  |  |
Loans receivable - current | $ 32 | $ 30 |  |
Less: Allowance for loans receivable - current | (32) | (30) | $ (29) | $ (30)
Other receivable | 3 |  |  |
Other | 157 | 139 |  |
Other current assets | $ 160 | $ 139 |  |

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