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Balance Sheet Details - Short-Term Investments (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Short-term investments |  |
Amortized cost | $ 90,455 | $ 89,328
Unrealized gains | 30 | 26
Unrealized losses | (65) | (86)
Estimated fair value | 90,420 | 89,268
U.S. Government bonds |  |
Short-term investments |  |
Amortized cost | 1,799 |
Unrealized losses | (12) |
Estimated fair value | $ 1,787 |
U.S. Government bonds | Minimum |  |
Short-term investments |  |
Maturity | 1 year |
U.S. Government bonds | Maximum |  |
Short-term investments |  |
Maturity | 3 years |
U.S. Government agency bonds |  |
Short-term investments |  |
Amortized cost | $ 3,697 | 9,535
Unrealized gains |  | 2
Unrealized losses | (12) | (22)
Estimated fair value | $ 3,685 | $ 9,515
U.S. Government agency bonds | Minimum |  |
Short-term investments |  |
Maturity |  | 1 year
U.S. Government agency bonds | Maximum |  |
Short-term investments |  |
Maturity | 3 years | 3 years
Bank certificates of deposit |  |
Short-term investments |  |
Amortized cost | $ 15,450 | $ 11,101
Unrealized gains | 8 | 13
Unrealized losses |  | (1)
Estimated fair value | $ 15,458 | $ 11,113
Bank certificates of deposit | Maximum |  |
Short-term investments |  |
Maturity | 1 year | 2 years
Commercial paper |  |
Short-term investments |  |
Amortized cost | $ 8,327 | $ 17,011
Unrealized gains | 1 | 1
Unrealized losses |  | (2)
Estimated fair value | $ 8,328 | $ 17,010
Commercial paper | Maximum |  |
Short-term investments |  |
Maturity | 1 year | 1 year
Corporate notes |  |
Short-term investments |  |
Amortized cost | $ 53,435 | $ 45,178
Unrealized gains | 20 | 7
Unrealized losses | (39) | (61)
Estimated fair value | $ 53,416 | $ 45,124
Corporate notes | Maximum |  |
Short-term investments |  |
Maturity | 3 years | 3 years
Asset-backed securities |  |
Short-term investments |  |
Amortized cost | $ 7,747 | $ 6,503
Unrealized gains | 1 | 3
Unrealized losses | (2) |
Estimated fair value | $ 7,746 | $ 6,506
Asset-backed securities | Maximum |  |
Short-term investments |  |
Maturity | 2 years | 2 years

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