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Carrying Amounts and Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Financial assets |  |
Cash and cash equivalents | $ 38,470 | $ 38,794
Accounts receivable | 227 | 199
Refundable deposits | 193 | 192
Investment in securities - current |  | 7,950
Investment in securities - noncurrent | 5,777 | 2,371
Financial liabilities |  |
Accounts payable | 44 | 53
Accrued expenses | 1,182 | 1,151
Lease liabilities - current and noncurrent | 970 | 1,333
Carrying Amount |  |
Financial assets |  |
Cash and cash equivalents | 38,470 | 38,794
Accounts receivable | 227 | 199
Restricted cash | 313 | 313
Refundable deposits | 193 | 192
Investment in securities - current |  | 7,950
Investment in securities - noncurrent | 5,777 | 2,371
Financial liabilities |  |
Accounts payable | 44 | 53
Accrued expenses | 1,182 | 1,151
Lease liabilities - current and noncurrent | 970 | 1,333
Estimated Fair Value |  |
Financial assets |  |
Cash and cash equivalents | 38,470 | 38,794
Accounts receivable | 227 | 199
Restricted cash | 313 | 313
Refundable deposits | 193 | 192
Investment in securities - current |  | 7,950
Investment in securities - noncurrent | 5,777 | 2,371
Financial liabilities |  |
Accounts payable | 44 | 53
Accrued expenses | 1,182 | 1,151
Lease liabilities - current and noncurrent | $ 970 | $ 1,333

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