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Carrying Amounts and Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financial assets |  |
Cash and cash equivalents | $ 45,702 | $ 57,743
Accounts receivable | 275 | 368
Refundable deposits | 208 | 199
Marketable securities - noncurrent (Note 8) | 10,000 |
Financial liabilities |  |
Accounts payable | 70 | 64
Accrued expenses | 1,516 | 1,280
Lease liabilities - current and noncurrent | 98 | 592
Carrying Amount |  |
Financial assets |  |
Cash and cash equivalents | 45,702 | 57,743
Accounts receivable | 275 | 368
Restricted cash | 300 | 531
Refundable deposits | 208 | 199
Marketable securities - noncurrent (Note 8) | 10,000 |
Financial liabilities |  |
Accounts payable | 70 | 64
Accrued expenses | 1,516 | 1,280
Lease liabilities - current and noncurrent | 98 | 592
Estimated Fair Value |  |
Financial assets |  |
Cash and cash equivalents | 45,702 | 57,743
Accounts receivable | 275 | 368
Restricted cash | 300 | 531
Refundable deposits | 208 | 199
Marketable securities - noncurrent (Note 8) | 10,000 |
Financial liabilities |  |
Accounts payable | 70 | 64
Accrued expenses | 1,516 | 1,280
Lease liabilities - current and noncurrent | $ 98 | $ 592

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