Fair Value Measurements Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2022

Fair Value Disclosures [Abstract]

Marketable Securities [Table Text Block]

The following tables summarize the levels of fair value measurements of our financial assets:

	December 31, 2022						December 31, 2021
(in thousands)	Total		Level 1		Level 2		Total		Level 1		Level 2
Money market funds	$	735,475	$	735,475	$	—	$	579,105	$	579,105	$	—
U.S. Treasury bills	29,703		29,703		—		5,782		5,782		—
Municipal bonds	3,365		—		3,365		26,009		—		26,009
Total financial assets	$	768,543	$	765,178	$	3,365	$	610,896	$	584,887	$	26,009

Schedule of Available-for-Sale Securities Reconciliation

The following is a summary of our available-for-sale marketable securities:

(in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
December 31, 2022
U.S. Treasury bills	$	29,782	$	—	$	(79)	$	29,703
Municipal bonds	3,369		—		(4)		3,365
December 31, 2021
U.S. Treasury bills	$	5,783	$	—	$	(1)	$	5,782
Municipal bonds	26,017		—		(8)		26,009