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The Company and its Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Cash and Cash Equivalents [Line Items] |  |
Amount of cash insured | $ 3,900 | $ 5,000
China |  |
Cash and Cash Equivalents [Line Items] |  |
Cash uninsured | 1,200 | 1,000
Singapore |  |
Cash and Cash Equivalents [Line Items] |  |
Cash uninsured | 149 | 232
Hong Kong |  |
Cash and Cash Equivalents [Line Items] |  |
Cash uninsured | $ 386 | $ 351

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- Definition The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
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- Definition The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
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