Cash Equivalents and Marketable Securities - Additional Information (Details) - USD ($) |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Sep. 30, 2020 |
Sep. 30, 2019 |
Sep. 30, 2020 |
Sep. 30, 2019 |
Dec. 31, 2019 |
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| Cash And Cash Equivalents [Line Items] | |||||
| Long-term marketable securities | $ 0 | $ 0 | $ 15,609,000 | ||
| Investments in an unrealized loss position | 0 | 0 | 4,500,000 | ||
| Unrealized losses | 0 | 0 | $ 3,000 | ||
| Recognition of other-than-temporary impairment | $ 0 | $ 0 | $ 0 | $ 0 | |
| Maximum | |||||
| Cash And Cash Equivalents [Line Items] | |||||
| Marketable securities maturity period | 1 year | 1 year | |||
| X | ||||||||||
- Definition Marketable securities maturity period. No definition available.
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| X | ||||||||||
- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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| X | ||||||||||
- Definition Amount of investment in marketable security, classified as noncurrent. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Details
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