Balance Sheet Components (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Inventory [Line Items]
Work-in-process inventories	$ 0	$ 0
Depreciation and amortization	2,127,000	1,032,000	$ 789,000
Short-term Investments	158,316,000
Cash Equivalents, at Carrying Value	55,158,000
Estimated Fair Value	$ 213,474,000
Money Market Funds [Member]
Inventory [Line Items]
Cash Equivalents, at Carrying Value		$ 21,062,000