Investments (Tables)

3 Months Ended

Mar. 31, 2022

Investments Debt And Equity Securities [Abstract]

Schedule of Investments

Investments consisted of the following (in thousands):

			Gross Unrealized
					Losses
	Amortized				Less than			Greater than			Estimated
March 31, 2022	Cost		Gains		One Year			One Year			Fair Value
Short-term investments:
Available-for-sale securities:
Corporate debt securities	$	96,729	$	16	$	(483	)	$	—		$	96,262
U.S. government and agency debt securities		83,261		7		(356	)		—			82,912
Non-U.S. government debt securities		67,533		14		(406	)		—			67,141
Total short-term investments		247,523		37		(1,245	)		—			246,315
Long-term investments:
Available-for-sale securities:
Corporate debt securities		132,275		—		(3,055	)		—			129,220
U.S. government and agency debt securities		79,824		—		(2,237	)		—			77,587
Non-U.S. government debt securities		21,801		—		(414	)		(189	)		21,198
		233,900		—		(5,706	)		(189	)		228,005
Held-to-maturity securities:
Certificates of deposit		1,820		—		—			—			1,820
Total long-term investments		235,720		—		(5,706	)		(189	)		229,825
Total investments	$	483,243	$	37	$	(6,951	)	$	(189	)	$	476,140
December 31, 2021
Short-term investments:
Available-for-sale securities:
Corporate debt securities	$	85,201	$	177	$	(39	)	$	—		$	85,339
U.S. government and agency debt securities		45,349		35		(24	)		—			45,360
Non-U.S. government debt securities		68,046		75		(53	)		—			68,068
Total short-term investments		198,596		287		(116	)		—			198,767
Long-term investments:
Available-for-sale securities:
Corporate debt securities		111,793		—		(654	)		—			111,139
U.S. government and agency debt securities		81,296		—		(517	)		—			80,779
Non-U.S. government debt securities		35,902		—		(210	)		—			35,692
		228,991		—		(1,381	)		—			227,610
Held-to-maturity securities:
Certificates of deposit		1,820		—		—			—			1,820
Total long-term investments		230,811		—		(1,381	)		—			229,430
Total investments	$	429,407	$	287	$	(1,497	)	$	—		$	428,197

Schedule of Proceeds from Sales and Maturities of Marketable Securities Plus Resulting Realized Gains and Losses

Realized gains and losses on the sales and maturities of investments, which were identified using the specific identification method, were as follows:

	Three Months Ended March 31,
(In thousands)	2022		2021
Proceeds from the sales and maturities of investments	$	60,779	$	86,193
Realized gains	$	—	$	—
Realized losses	$	—	$	—

Schedule of Contractual Maturities of Available-for-Sale and Held-to-Maturity Securities

The Company’s available-for-sale and held-to-maturity securities at March 31, 2022 had contractual maturities in the following periods:

	Available-for-sale				Held-to-maturity
	Amortized		Estimated		Amortized		Estimated
(In thousands)	Cost		Fair Value		Cost		Fair Value
Within 1 year	$	247,523	$	246,315	$	1,820	$	1,820
After 1 year through 5 years		233,900		228,005		—		—
Total	$	481,423	$	474,320	$	1,820	$	1,820