Fair Value Measurements Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2023

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block]

The following table summarizes the levels of fair value measurements of our financial assets:

	December 31, 2023						December 31, 2022
(in thousands)	Total		Level 1		Level 2		Total		Level 1		Level 2
Money market funds	$	730,508	$	730,508	$	—	$	735,475	$	735,475	$	—
U.S. Treasury bills	15,905		15,905		—		29,703		29,703		—
Municipal bonds	—		—		—		3,365		—		3,365
	746,413		746,413		—		768,543		765,178		3,365
Deposits - money market funds	22,292		22,292		—		—		—		—
Total	$	768,705	$	768,705	$	—	$	768,543	$	765,178	$	3,365

Investments Classified by Contractual Maturity Date [Table Text Block]

As of December 31, 2023, the contractual maturities of all marketable securities in our portfolio were less than one year.

Debt Securities, Available-for-sale

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, 2023
U.S. Treasury bills	$	15,896	$	9	$	—	$	15,905
December 31, 2022
U.S. Treasury bills	$	29,782	$	—	$	(79)	$	29,703
Municipal bonds	3,369		—		(4)		3,365