Fair Value Measurements Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2022

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:

	June 30, 2022						December 31, 2021
(in thousands)	Total		Level 1		Level 2		Total		Level 1		Level 2
Money market funds	$	488,689	$	488,689	$	—	$	579,105	$	579,105	$	—
U.S. Treasury bills	8,032		8,032		—		5,782		5,782		—
Municipal bonds	22,749		—		22,749		26,009		—		26,009
Total	$	519,470	$	496,721	$	22,749	$	610,896	$	584,887	$	26,009

Investments Classified by Contractual Maturity Date [Table Text Block]

As of June 30, 2022, the contractual maturities of the 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
June 30, 2022
U.S. Treasury bills	$	8,056	$	—	$	(24)	$	8,032
Municipal bonds	22,783		2		(36)		22,749
December 31, 2021
U.S. Treasury bills	$	5,783	$	—	$	(1)	$	5,782
Municipal bonds	26,017		—		(8)		26,009