Cash, Cash Equivalents and Marketable Securities - Additional Information (Details) |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2020
USD ($)
item
|
Dec. 31, 2019
USD ($)
item
|
Dec. 31, 2018
USD ($)
item
|
|
| Investments Debt And Equity Securities [Abstract] | |||
| Realized gains (losses) | $ 0 | $ 0 | $ 0 |
| Number of investments adjusted for other-than-temporary declines in fair value | item | 0 | 0 | 0 |
| Marketable securities | $ 0 | $ 49,975,000 | |
| X | ||||||||||
- Definition Number of investments adjusted for other-than-temporary declines in fair value. No definition available.
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| X | ||||||||||
- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. No definition available.
|
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of investment in marketable security, classified as current. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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