Balance Sheet Components (Schedule of Amortized Cost and Estimated Fair Market Value of Investments Classified as Available-for-Sale Excluding Cash Equivalents) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 108,311	$ 98,499
Unrealized Gains	0	128
Unrealized Losses	(38)	0
Estimated Fair Value	108,273	98,627
U.S. Treasury Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	108,138	98,326
Unrealized Gains	0	128
Unrealized Losses	(38)	0
Estimated Fair Value	108,100	98,454
Convertible debt securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	173	173
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	$ 173	$ 173