Balance Sheet Components (Summary of Available-for-sale Investments and Restricted Cash) (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025	Jun. 30, 2025
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 240,818	$ 267,736
Gross Unrealized Gains		169
Gross Unrealized Losses	(569)	(15)
Cash equivalents	23,069	27,806
Short-term investments	128,189	132,010
Long-term investments	84,289	103,365
Restricted cash	4,702	4,709	$ 4,475
Estimated Fair Value	240,249	267,890
Money Market Funds Included In Cash Equivalents [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	23,069	27,806
Estimated Fair Value	23,069	27,806
Money Market Funds Included In Restricted Cash, Noncurrent [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	4,702	4,709
Estimated Fair Value	4,702	4,709
U.S. Government Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	71,521	81,385
Gross Unrealized Gains		94
Gross Unrealized Losses	(160)
Estimated Fair Value	71,361	81,479
U.S. Treasury Bills [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	4,954	39,568
Gross Unrealized Gains		25
Gross Unrealized Losses	(2)
Estimated Fair Value	4,952	39,593
Corporate Bonds/Notes [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	66,866	57,564
Gross Unrealized Gains		19
Gross Unrealized Losses	(124)	(12)
Estimated Fair Value	66,742	57,571
Agency Bonds/Notes [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	44,236	25,147
Gross Unrealized Gains		7
Gross Unrealized Losses	(237)	(3)
Estimated Fair Value	43,999	25,151
Asset-Backed Securities [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	17,584	21,689
Gross Unrealized Gains		22
Gross Unrealized Losses	(40)
Estimated Fair Value	17,544	21,711
Commercial Paper [Member]
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	7,886	9,868
Gross Unrealized Gains		2
Gross Unrealized Losses	(6)
Estimated Fair Value	$ 7,880	$ 9,870