Balance Sheet Components (Available-for-Sale Investments in Unrealized Loss Position) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months	$ 117,505	$ 76,813
Unrealized Loss, Less than 12 months	(285)	(181)
US Treasury Bills [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months	2,949
Corporate Bonds/Notes [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months	33,744	1,490
Unrealized Loss, Less than 12 months	(93)	(13)
U.S. Government Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months	7,985	73,329
Unrealized Loss, Less than 12 months	(1)	(164)
Asset-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months		1,994
Unrealized Loss, Less than 12 months		$ (4)
Agency bonds/notes [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months	72,827
Unrealized Loss, Less than 12 months	$ (191)