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Balance Sheet Account Details - Investment Categories (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Short-term investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | $ 292,225 | $ 324,567
Gross unrealized gains | 842 | 1,302
Gross unrealized losses | (2,370) | (1,391)
Estimated fair value | 290,697 | 324,478
Mutual fund |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 152,136 | 151,512
Gross unrealized gains | 0 | 386
Gross unrealized losses | (249) | 0
Estimated fair value | 151,887 | 151,898
Bank deposits |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 63,389 | 84,120
Gross unrealized gains | 13 | 35
Gross unrealized losses | (21) | (1)
Estimated fair value | 63,381 | 84,154
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 36,008 | 45,459
Gross unrealized gains | 2 | 27
Gross unrealized losses | (12) | (1)
Estimated fair value | 35,998 | 45,485
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 29,308 | 30,512
Gross unrealized gains | 17 | 99
Gross unrealized losses | (38) | (1)
Estimated fair value | 29,287 | 30,610
Agency bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost |  | 4,499
Gross unrealized gains |  | 2
Gross unrealized losses |  | 0
Estimated fair value |  | 4,501
Corporate equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 5,807 | 4,466
Gross unrealized gains | 402 | 360
Gross unrealized losses | (2,027) | (1,388)
Estimated fair value | 4,182 | 3,438
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 5,577 |
Gross unrealized gains | 0 |
Gross unrealized losses | (23) |
Estimated fair value | 5,554 |
Treasury bills |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost |  | 3,999
Gross unrealized gains |  | 0
Gross unrealized losses |  | 0
Estimated fair value |  | 3,999
Warrants |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 0 | 0
Gross unrealized gains | 408 | 393
Gross unrealized losses | 0 | 0
Estimated fair value | $ 408 | $ 393

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