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Balance Sheet Account Details - Available-for-Sale Debt Securities in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Gross Unrealized Losses |  |
Less than 12 months | $ (34) | $ (3)
12 months or greater | (60) | 0
Total | (94) | (3)
Estimated Fair Value |  |
Less than 12 months | 53,949 | 26,232
12 months or greater | 18,674 | 0
Total | 72,623 | 26,232
Bank deposits |  |
Gross Unrealized Losses |  |
Less than 12 months | (13) | (1)
12 months or greater | 0 | 0
Total | (13) | (1)
Estimated Fair Value |  |
Less than 12 months | 20,008 | 14,013
12 months or greater | 0 | 0
Total | 20,008 | 14,013
Corporate bonds |  |
Gross Unrealized Losses |  |
Less than 12 months | (15) | (1)
12 months or greater | (5) | 0
Total | (20) | (1)
Estimated Fair Value |  |
Less than 12 months | 27,252 | 4,526
12 months or greater | 2,996 | 0
Total | 30,248 | 4,526
Commercial paper |  |
Gross Unrealized Losses |  |
Less than 12 months | (6) | (1)
12 months or greater | (32) | 0
Total | (38) | (1)
Estimated Fair Value |  |
Less than 12 months | 6,689 | 7,693
12 months or greater | 10,125 | 0
Total | 16,814 | $ 7,693
U.S. government securities |  |
Gross Unrealized Losses |  |
Less than 12 months | 0 |
12 months or greater | (23) |
Total | (23) |
Estimated Fair Value |  |
Less than 12 months | 0 |
12 months or greater | 5,553 |
Total | $ 5,553 |

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