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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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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).

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