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Balance Sheet Account Details - Investment Categories (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cost | $ 108,778 | $ 292,225
Gross unrealized gains | 415 | 842
Gross unrealized losses | (5,451) | (2,370)
Estimated fair value | 103,742 | 290,697
Mutual fund |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 81,815 | 152,136
Gross unrealized gains | 0 | 0
Gross unrealized losses | (1,050) | (249)
Estimated fair value | 80,765 | 151,887
Bank deposits |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 5,012 | 63,389
Gross unrealized gains | 2 | 13
Gross unrealized losses | (34) | (21)
Estimated fair value | 4,980 | 63,381
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 7,211 | 36,008
Gross unrealized gains | 3 | 2
Gross unrealized losses | 0 | (12)
Estimated fair value | 7,214 | 35,998
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 6,701 | 29,308
Gross unrealized gains | 13 | 17
Gross unrealized losses | (58) | (38)
Estimated fair value | 6,656 | 29,287
Corporate equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 5,807 | 5,807
Gross unrealized gains | 262 | 402
Gross unrealized losses | (4,239) | (2,027)
Estimated fair value | 1,830 | 4,182
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 2,232 | 5,577
Gross unrealized gains | 0 | 0
Gross unrealized losses | (70) | (23)
Estimated fair value | 2,162 | 5,554
Warrants |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 0 | 0
Gross unrealized gains | 135 | 408
Gross unrealized losses | 0 | 0
Estimated fair value | $ 135 | $ 408

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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 https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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