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		Dec. 31, 2022	Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		$ 74,472	$ 1,275
Unrealized Gains		0	0
Unrealized Losses		(320)	0
Estimated Fair Value		74,152	1,275
U.S. Treasury Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		74,120
Unrealized Gains		0
Unrealized Losses		(320)
Estimated Fair Value		73,800
Corporate Equity Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost			751
Unrealized Gains			0
Unrealized Losses			0
Estimated Fair Value			751
Convertible Debt
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	[1]	346	518
Unrealized Gains	[1]	0	0
Unrealized Losses	[1]	0	0
Estimated Fair Value	[1]	346	518
Certificates of Deposit
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		6	6
Unrealized Gains		0	0
Unrealized Losses		0	0
Estimated Fair Value		$ 6	$ 6

[1] On the Company’s consolidated balance sheets, $173,000 included in Short-term investments as of December 31, 2022, and December 31, 2021, and $173,000 and $346,000 included in Other non-current assets as of December 31, 2022, and December 31, 2021, respectively.