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Other Balance Sheet Details - Investment categories (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Short-term investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | $ 120,758 | $ 97,891
Gross unrealized gains | 1,564 | 4,944
Gross unrealized losses | (26) | (44)
Estimated fair value | 122,296 | 102,791
Bank Deposits |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 40,715 | 43,043
Gross unrealized gains | 19 | 0
Gross unrealized losses | 0 | (4)
Estimated fair value | 40,734 | 43,039
Corporate Bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 11,031 | 41,238
Gross unrealized gains | 0 | 0
Gross unrealized losses | (5) | (35)
Estimated fair value | 11,026 | 41,203
Corporate Equity Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 1,512 | 1,843
Gross unrealized gains | 1,542 | 4,944
Gross unrealized losses | 0 | 0
Estimated fair value | 3,054 | 6,787
Commercial Paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 33,074 | 1,747
Gross unrealized gains | 2 | 0
Gross unrealized losses | (9) | 0
Estimated fair value | 33,067 | 1,747
Agency bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 7,294 |
Gross unrealized gains | 1 |
Gross unrealized losses | 0 |
Estimated fair value | 7,295 |
U.S. Government bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 7,508 |
Gross unrealized gains | 0 |
Gross unrealized losses | (1) |
Estimated fair value | 7,507 |
Asset-backed Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost |  | 10,020
Gross unrealized gains |  | 0
Gross unrealized losses |  | (5)
Estimated fair value |  | $ 10,015
Municipal bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 19,624 |
Gross unrealized gains | 0 |
Gross unrealized losses | (11) |
Estimated fair value | $ 19,613 |

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