Short-term Investments (Tables)

12 Months Ended

Dec. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Short-Term Investments Available-for-Sale Securities

Short-term investments consisted of available-for-sale and equity securities as follows (in thousands):

Type of securities as of December 31, 2022	Amortized cost		Gross unrealized gains		Gross unrealized losses		Fair value
Corporate debt securities	$	62,862	$	—	$	(359)	$	62,503
U.S. government-related debt securities	22,009		—		(230)		21,779
Total available-for-sale debt securities	$	84,871	$	—	$	(589)	$	84,282

Type of securities as of December 31, 2021	Amortized cost		Gross unrealized gains		Gross unrealized losses		Fair value
Corporate debt securities	$	177,375	$	3	$	(195)	$	177,183
U.S. government-related debt securities	33,134		2		(97)		33,039
Asset-backed securities	31,631		—		(32)		31,599
Total available-for-sale debt securities	$	242,140	$	5	$	(324)	$	241,821

Fair Values of Available-for-Sale Securities by Contractual Maturity

The fair values of available-for-sale debt securities by contractual maturity at December 31 were as follows (in thousands):

	2022		2021
Maturing in one year or less	$	81,004	$	174,534
Maturing in one to three years	3,278		67,287
Total available-for-sale debt securities	$	84,282	$	241,821

Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value

The following table summarizes investments that have been in a continuous unrealized loss position as of December 31, 2022 (in thousands).

	Less than 12 months				12 months or greater				Total
	Fair Value		Gross unrealized losses		Fair Value		Gross unrealized losses		Fair Value		Gross unrealized losses
Corporate debt securities	$	10,232	$	(52)	$	48,271	$	(307)	$	58,503	$	(359)
U.S. government-related debt securities	3,988		(16)		17,790		(214)		21,778		(230)
Total	$	14,220	$	(68)	$	66,061	$	(521)	$	80,281	$	(589)