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Balance Sheet Details - Short-Term Investments (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Short-term investments |  |
Amortized cost | $ 193,569 | $ 237,724
Unrealized gains | 12 | 3
Unrealized losses | (1,653) | (4,557)
Estimated fair value | 191,928 | 233,170
U.S. government agency bonds |  |
Short-term investments |  |
Amortized cost | 47,989 | 88,478
Unrealized losses | (658) | (2,413)
Estimated fair value | $ 47,331 | $ 86,065
U.S. government agency bonds | Maximum |  |
Short-term investments |  |
Maturity | 3 years | 3 years
U.S. treasury securities |  |
Short-term investments |  |
Amortized cost | $ 95,929 | $ 52,991
Unrealized losses | (320) | (384)
Estimated fair value | $ 95,609 | $ 52,607
U.S. treasury securities | Maximum |  |
Short-term investments |  |
Maturity | 2 years | 1 year
Bank certificates of deposit |  |
Short-term investments |  |
Amortized cost | $ 11,300 | $ 17,500
Unrealized gains | 1 | 3
Unrealized losses | (1) | (11)
Estimated fair value | $ 11,300 | $ 17,492
Bank certificates of deposit | Maximum |  |
Short-term investments |  |
Maturity | 2 years | 1 year
Corporate notes |  |
Short-term investments |  |
Amortized cost | $ 22,104 | $ 41,464
Unrealized gains | 11 |
Unrealized losses | (403) | (978)
Estimated fair value | $ 21,712 | $ 40,486
Corporate notes | Maximum |  |
Short-term investments |  |
Maturity | 3 years | 3 years
Asset-backed securities |  |
Short-term investments |  |
Amortized cost | $ 8,613 | $ 21,656
Unrealized losses | (226) | (360)
Estimated fair value | $ 8,387 | $ 21,296
Asset-backed securities | Maximum |  |
Short-term investments |  |
Maturity | 2 years | 2 years
Municipal bonds |  |
Short-term investments |  |
Amortized cost | $ 7,634 | $ 15,635
Unrealized losses | (45) | (411)
Estimated fair value | $ 7,589 | $ 15,224
Municipal bonds | Maximum |  |
Short-term investments |  |
Maturity | 3 years | 3 years

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