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Balance Sheet Account Details - Available-for-Sale Debt Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Gross Unrealized Losses |  |
Less than 12 months | $ (3) | $ (19)
12 months or greater | 0 | 0
Total | (3) | (19)
Estimated Fair Value |  |
Less than 12 months | 26,232 | 137,946
12 months or greater | 0 | 0
Total | 26,232 | 137,946
Bank deposits |  |
Gross Unrealized Losses |  |
Less than 12 months | (1) | (3)
12 months or greater | 0 | 0
Total | (1) | (3)
Estimated Fair Value |  |
Less than 12 months | 14,013 | 58,584
12 months or greater | 0 | 0
Total | 14,013 | 58,584
Corporate bonds |  |
Gross Unrealized Losses |  |
Less than 12 months | (1) |
12 months or greater | 0 |
Total | (1) |
Estimated Fair Value |  |
Less than 12 months | 4,526 |
12 months or greater | 0 |
Total | 4,526 |
Commercial paper |  |
Gross Unrealized Losses |  |
Less than 12 months | (1) | (16)
12 months or greater | 0 | 0
Total | (1) | (16)
Estimated Fair Value |  |
Less than 12 months | 7,693 | 79,362
12 months or greater | 0 | 0
Total | $ 7,693 | $ 79,362

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