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Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in securities - current |  | $ 7,950
Investment in securities - noncurrent | $ 5,777 | 2,371
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in securities - current |  | 7,950
Investment in securities - noncurrent | 5,777 | 2,371
Total | 6,090 | 10,634
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total | 313 | 313
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in securities - current |  | 7,950
Investment in securities - noncurrent | 5,777 | 2,371
Total | 5,777 | 10,321
Fair Value, Measurements, Recurring | Bank Time Deposits |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Restricted cash - time deposits | 313 | 313
Fair Value, Measurements, Recurring | Bank Time Deposits | Fair Value Measurements Using Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Restricted cash - time deposits | $ 313 | $ 313

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