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Balance Sheet Account Details - Investment Categories (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale
Cost	$ 120,874	$ 108,778
Gross unrealized gains	79	415
Gross unrealized losses	(5,783)	(5,451)
Estimated fair value	115,170	103,742
Bond Fund
Debt Securities, Available-for-sale
Cost	63,763	81,815
Gross unrealized gains	0	0
Gross unrealized losses	(537)	(1,050)
Estimated fair value	63,226	80,765
Bank deposits
Debt Securities, Available-for-sale
Cost	17,165	5,012
Gross unrealized gains	12	2
Gross unrealized losses	(1)	(34)
Estimated fair value	17,176	4,980
Corporate bonds
Debt Securities, Available-for-sale
Cost	14,850	6,701
Gross unrealized gains	40	13
Gross unrealized losses	(2)	(58)
Estimated fair value	14,888	6,656
Commercial paper
Debt Securities, Available-for-sale
Cost	11,578	7,211
Gross unrealized gains	9	3
Gross unrealized losses	(1)	0
Estimated fair value	11,586	7,214
U.S. government securities
Debt Securities, Available-for-sale
Cost	6,736	2,232
Gross unrealized gains	18	0
Gross unrealized losses	(3)	(70)
Estimated fair value	6,751	2,162
Municipal bonds
Debt Securities, Available-for-sale
Cost	1,007
Gross unrealized gains	0
Gross unrealized losses	(4)
Estimated fair value	1,003
Corporate equity securities
Debt Securities, Available-for-sale
Cost	5,775	5,807
Gross unrealized gains	0	262
Gross unrealized losses	(5,235)	(4,239)
Estimated fair value	$ 540	1,830
Warrants
Debt Securities, Available-for-sale
Cost		0
Gross unrealized gains		135
Gross unrealized losses		0
Estimated fair value		$ 135

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