Investments (Tables)

3 Months Ended

Mar. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Components of Investments

The components of investments were as follows:

	As of March 31, 2022
	Adjusted Cost Basis		Unrealized Gains		Unrealized Losses		Fair Value		Cash and Cash Equivalents		Marketable Securities - Current		Marketable Securities - Non-current
Asset backed securities	$	113,392	$	3	$	(357)	$	113,038	$	—	$	6,364	$	106,674
Certificates of deposits	6,005		—		(5)		6,000		—		6,000		—
Corporate notes and bonds	235,942		2		(1,707)		234,237		—		171,187		63,051
Commercial paper	129,290		4		(93)		129,202		26,282		102,921		—
Money market funds	5,615		—		—		5,615		5,615		—		—
Foreign government securities	18,289		—		(137)		18,151		—		18,151		—
US government and agency securities	72,938		1		(5)		72,934		7,989		64,943		—
Total investments	$	581,471	$	10	$	(2,304)	$	579,177	$	39,886	$	369,566	$	169,725

	As of December 31, 2021
	Adjusted Cost Basis		Unrealized Gains		Unrealized Losses		Fair Value		Cash and Cash Equivalents		Marketable Securities - Current		Marketable Securities - Non-current
Asset backed securities	$	111,619	$	1	$	(68)	$	111,552	$	—	$	5,372	$	106,180
Certificates of deposits	6,002		—		—		6,002		—		6,002		—
Corporate notes and bonds	207,169		21		(201)		206,990		3,026		132,688		71,276
Commercial paper	109,391		—		—		109,391		24,193		85,198		—
Money market funds	51,768		—		—		51,768		51,768		—
Foreign government securities	8,186		—		(5)		8,181		—		3,008		5,173
US government securities	86,783		4		—		86,787		—		86,787		—
Total investments	$	580,918	$	26	$	(274)	$	580,671	$	78,987	$	319,055	$	182,629

Schedule of Debt Investment Maturities

	Adjusted		Estimated
	Cost Basis		Fair Value
March 31, 2022
Due in one year or less	$	370,511	$	369,566
Due after one year through five years	171,074		169,725
Due after five years through ten years	—		—
Total	$	541,585	$	539,291