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Carrying Amounts and Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financial assets |  |
Cash and cash equivalents | $ 41,455 | $ 45,702
Accounts receivable | 265 | 275
Refundable deposits | 211 | 208
Marketable securities - noncurrent | 10,322 | 10,000
Financial liabilities |  |
Accounts payable | 118 | 70
Accrued expenses | 1,435 | 1,516
Lease liabilities - current and noncurrent | 1,987 | 98
Carrying Amount |  |
Financial assets |  |
Cash and cash equivalents | 41,455 | 45,702
Accounts receivable | 265 | 275
Restricted cash | 306 | 300
Refundable deposits | 211 | 208
Marketable securities - noncurrent | 10,322 | 10,000
Financial liabilities |  |
Accounts payable | 118 | 70
Accrued expenses | 1,435 | 1,516
Lease liabilities - current and noncurrent | 1,987 | 98
Estimated Fair Value |  |
Financial assets |  |
Cash and cash equivalents | 41,455 | 45,702
Accounts receivable | 265 | 275
Restricted cash | 306 | 300
Refundable deposits | 211 | 208
Marketable securities - noncurrent | 10,322 | 10,000
Financial liabilities |  |
Accounts payable | 118 | 70
Accrued expenses | 1,435 | 1,516
Lease liabilities - current and noncurrent | $ 1,987 | $ 98

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