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Other Current Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Other Assets [Abstract] |  |  |  |
Loans receivable - current | $ 33 | $ 32 |  |
Less: Allowance for loans receivable - current | (33) | (32) | $ (30) | $ (29)
Other receivable |  | 3 |  |
Other | 155 | 157 |  |
Other current assets | $ 155 | $ 160 |  |

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