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Carrying Amounts and Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financial assets |  |
Cash and cash equivalents | $ 34,781 | $ 38,470
Accounts receivable | 141 | 227
Refundable deposits | 182 | 193
Investment in securities - noncurrent | 5,441 | 5,777
Financial liabilities |  |
Accounts payable | 38 | 44
Accrued expenses | 745 | 1,182
Lease liabilities - current and noncurrent | 500 | 970
Carrying Amount |  |
Financial assets |  |
Cash and cash equivalents | 34,781 | 38,470
Accounts receivable | 141 | 227
Restricted cash | 313 | 313
Refundable deposits | 182 | 193
Investment in securities - noncurrent | 5,441 | 5,777
Financial liabilities |  |
Accounts payable | 38 | 44
Accrued expenses | 745 | 1,182
Lease liabilities - current and noncurrent | 500 | 970
Estimated Fair Value |  |
Financial assets |  |
Cash and cash equivalents | 34,781 | 38,470
Accounts receivable | 141 | 227
Restricted cash | 313 | 313
Refundable deposits | 182 | 193
Investment in securities - noncurrent | 5,441 | 5,777
Financial liabilities |  |
Accounts payable | 38 | 44
Accrued expenses | 745 | 1,182
Lease liabilities - current and noncurrent | $ 500 | $ 970

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- Definition Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 852 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481372/852-10-55-10 + Details
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