Cash, Cash Equivalents and Investments (Tables)

12 Months Ended

Dec. 31, 2021

Cash, Cash Equivalents and Investments

Summary of Cash, Cash Equivalents, Marketable Securities, and Available-for-Sale Investments

The following table summarizes our cash, cash equivalents, marketable securities, and available-for-sale investments at December 31, 2021 (in thousands):

	As of December 31, 2021
			Gross		Gross				Cash and
	Amortized		Unrealized		Unrealized				Cash		Marketable		Short-Term		Long-Term
	Cost		Gains		Losses		Fair Value		Equivalents		Securities		Investments		Investments
Cash	$	353,488	$	—	$	—	$	353,488	$	353,488	$	—	$	—	$	—
Level 1:
Money market funds		2,844		—		—		2,844		2,844		—		—		—
Agency bonds		10,700		4		—		10,704		—		—		10,704		—
Marketable securities		90,000		—		(17,820)		72,180		—		72,180		—		—
Subtotal		103,544		4		(17,820)		85,728		2,844		72,180		10,704		—
Level 2:
State and municipal obligations		2,570		—		(5)		2,565		—		—		1,400		1,165
Corporate bonds		32,748		1		(276)		32,473		—		—		2,406		30,067
Subtotal		35,318		1		(281)		35,038		—		—		3,806		31,232
Total	$	492,350	$	5	$	(18,101)	$	474,254	$	356,332	$	72,180	$	14,510	$	31,232

The following table summarizes our cash, cash equivalents, and held-to-maturity investments at December 31, 2020 (in thousands):

	As of December 31, 2020
			Gross		Gross				Cash and
	Amortized		Unrealized		Unrealized				Cash		Short-Term		Long-Term
	Cost		Gains		Losses		Fair Value		Equivalents		Investments		Investments
Cash	$	116,107	$	—	$	—	$	116,107	$	116,107	$	—	$	—
Level 1:
Money market funds		23,611		—		—		23,611		23,611		—		—
Agency bonds		63,794		122		—		63,916		—		23,794		40,000
Treasury bills		96,384		6		—		96,390		—		96,384		—
Subtotal		183,789		128		—		183,917		23,611		120,178		40,000
Level 2:
State and municipal obligations		77,130		25		(28)		77,127		—		66,519		10,611
Certificates of deposit		500		—		—		500		—		500		—
Corporate bonds		212,825		232		(100)		212,957		2,525		170,205		40,095
U.S. Treasury repurchase agreements		13,200		—		—		13,200		13,200		—		—
Treasury inflation-protected securities		3,291		16		—		3,307		—		3,291		—
Commercial paper		45,974		—		—		45,974		—		45,974		—
Subtotal		352,920		273		(128)		353,065		15,725		286,489		50,706
Total	$	652,816	$	401	$	(128)	$	653,089		155,443		406,667		90,706
Expected credit loss reserve										(3)		(142)		(25)
Total, net of reserve for expected credit losses									$	155,440	$	406,525	$	90,681