Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2023

Financial Instruments, Owned, at Fair Value, by Type, Alternative [Abstract]

Marketable Securities [Table Text Block]

The following is a summary of available-for-sale financial instruments, as of September 30, 2023 and December 31, 2022, respectively (in thousands):

	September 30, 2023
	Amortized Cost		Unrealized Gain		Unrealized Losses			Fair Value
Marketable securities:
Corporate securities (1)	$	186,410	$	4	$	(2,034	)	$	184,380
U.S. treasury and agency securities		39,829		-		(199	)		39,630
Total Marketable securities	$	226,239	$	4	$	(2,233	)	$	224,010
(1) Comprised primarily of corporate bonds and commercial paper

	December 31, 2022
	Amortized Cost		Unrealized Gain		Unrealized Losses			Fair Value
Marketable securities:
Corporate securities (1)	$	184,321	$	75	$	(2,344	)	$	182,052
U.S. treasury and agency securities		34,071		3		(200	)		33,874
Total Marketable securities	$	218,392	$	78	$	(2,544	)	$	215,926
(1) Comprised primarily of corporate bonds and commercial paper

Debt Securities, Available-for-Sale [Table Text Block]

As of September 30, 2023, the fair values of available-for-sale financial instruments, by remaining contractual maturity, were as follows (in thousands):

Due within one year	$	156,419
Due in one to five years		67,591
Total	$	224,010