Short-term Investments (Tables)

3 Months Ended

Mar. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Debt Securities, Available-for-sale

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

Type of securities as of March 31, 2022	Amortized cost		Gross unrealized gains		Gross unrealized losses		Fair value
Corporate debt securities	$	142,862	$	—	$	(873)	$	141,989
Government-related debt securities	40,574		—		(345)		40,229
Asset-backed securities	31,475		—		(75)		31,400
Total available-for-sale debt securities	$	214,911	$	—	$	(1,293)	$	213,618

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
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 were as follows (in thousands):

	March 31, 2022		December 31, 2021
Maturing in one year or less	$	187,712	$	174,534
Maturing in one to three years	25,906		67,287
Total available-for-sale debt securities	$	213,618	$	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 March 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	$	75,500	$	(873)	$	—	$	—	$	75,500	$	(873)
Government-related debt securities	40,229		(345)		—		—		40,229		(345)
Asset Backed Securities	31,399		(75)		—		—		31,399		(75)
Total	$	147,128	$	(1,293)	$	—	$	—	$	147,128	$	(1,293)