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Basis of Presentation and Summary of Significant Accounting Policies - Available-for-Sale Debt Securities in an Unrealized Loss Position (Details) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Gross Unrealized Losses |  |
Less than 12 months | $ (400) | $ (19,000)
12 months or greater | 0 | 0
Total | (400) | (19,000)
Estimated Fair Value |  |
Less than 12 months | 8,018,000 | 137,947,000
12 months or greater | 0 | 0
Total | 8,018,000 | 137,947,000
Bank deposits |  |
Gross Unrealized Losses |  |
Less than 12 months | 0 | (3,000)
12 months or greater | 0 | 0
Total | 0 | (3,000)
Estimated Fair Value |  |
Less than 12 months | 5,011,000 | 58,584,000
12 months or greater | 0 | 0
Total | 5,011,000 | 58,584,000
Corporate bonds |  |
Gross Unrealized Losses |  |
Less than 12 months | (400) |
12 months or greater | 0 |
Total | (400) |
Estimated Fair Value |  |
Less than 12 months | 3,007,000 |
12 months or greater | 0 |
Total | $ 3,007,000 |
Commercial paper |  |
Gross Unrealized Losses |  |
Less than 12 months |  | (16,000)
12 months or greater |  | 0
Total |  | (16,000)
Estimated Fair Value |  |
Less than 12 months |  | 79,363,000
12 months or greater |  | 0
Total |  | $ 79,363,000

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