Fair Value Measurements - Additional Information (Details) - USD ($) |
12 Months Ended | ||
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Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
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Fair Value Disclosures [Abstract] | |||
Maturities of marketable securities | $ 69,000,000 | $ 18,000,000 | $ 0 |
Gross realized gains from sales of marketable securities | 17,467,000 | ||
Gain on sale of marketable securities | 4,000 | 0 | 0 |
Interest earned on marketable securities | $ 6,000 | $ 77,000 | $ 0 |
X | ||||||||||
- Definition Proceeds From Sale Of Marketable Securities No definition available.
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X | ||||||||||
- References No definition available.
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X | ||||||||||
- Definition The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of cash inflow from maturity, prepayment and call of 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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