Accrued and Other Current Liabilities  | 
12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2020  | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Payables And Accruals [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accrued and Other Current Liabilities | 
 5. Accrued and Other Current Liabilities Accrued and other current liabilities consist of the following: 
 
 
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| X | ||||||||||
- Definition The entire disclosure for accounts payable, accrued expenses, and other liabilities that are classified as current at the end of the reporting period. No definition available. 
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| X | ||||||||||
- References No definition available. 
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