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Balance Sheet Account Details - Investment Categories (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Short-term investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | $ 941,174 | $ 600,154
Gross unrealized gains | 933 | 1,226
Gross unrealized losses | (2,118) | (163)
Estimated fair value | 939,989 | 601,217
Bank deposits |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 411,690 | 311,066
Gross unrealized gains | 188 | 26
Gross unrealized losses | (3) | (29)
Estimated fair value | 411,875 | 311,063
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 63,818 | 53,223
Gross unrealized gains | 161 | 1
Gross unrealized losses | 0 | (45)
Estimated fair value | 63,979 | 53,179
Corporate equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 4,506 | 135
Gross unrealized gains | 416 | 1,191
Gross unrealized losses | (1,850) | 0
Estimated fair value | 3,072 | 1,326
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 210,525 | 225,731
Gross unrealized gains | 43 | 8
Gross unrealized losses | (16) | (76)
Estimated fair value | 210,552 | 225,663
Warrants |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 0 |
Gross unrealized gains | 125 |
Gross unrealized losses | 0 |
Estimated fair value | 125 |
Mutual fund |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 250,635 |
Gross unrealized gains | 0 |
Gross unrealized losses | (249) |
Estimated fair value | $ 250,386 |
U.S. Government bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost |  | 7,982
Gross unrealized gains |  | 0
Gross unrealized losses |  | (9)
Estimated fair value |  | 7,973
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost |  | 2,017
Gross unrealized gains |  | 0
Gross unrealized losses |  | (4)
Estimated fair value |  | $ 2,013

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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