Cash, Cash Equivalents and Investments (Tables)

12 Months Ended

Dec. 31, 2019

Cash and Cash Equivalents [Abstract]

Summary of Cash, Cash Equivalents and Held-to-Maturity Investments by Type

The following tables summarize the Company's cash, cash equivalents, and held-to-maturity investments at December 31, 2019 and December 31, 2018 (in thousands):

	As of December 31, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Cash and Cash Equivalents		Short-Term Investments		Long-Term Investments
Cash	$	103,319	$	—	$	—		$	103,319	$	103,319	$	—	$	—
Level 1:
Money market funds	8,845		—		—			8,845		8,845		—		—
Agency bonds	32,869		14		(4		)	32,879		—		15,131		17,738
Subtotal	41,714		14		(4		)	41,724		8,845		15,131		17,738
Level 2:
State and municipal obligations	25,038		8		—			25,046				21,560		3,478
Certificates of deposit	1,400		—		—			1,400		—		1,400		—
Corporate bonds	135,175		71		(30		)	135,216		886		113,241		21,048
U.S. Treasury repurchase agreements	57,200		—		—			57,200		57,200		—		—
Treasury inflation-protected securities	3,235		14		—			3,249		—		—		3,235
Commercial paper	29,202		—		—			29,202		2,000		27,202		—
Subtotal	251,250		93		(30		)	251,313		60,086		163,403		27,761
Total	$	396,283	$	107	$	(34	)	$	396,356	$	172,250	$	178,534	$	45,499

	As of December 31, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value		Cash and Cash Equivalents		Short-Term Investments		Long-Term Investments
Cash	$	144,095	$	—	$	—	$	144,095	$	144,095	$	—	$	—
Level 1:
Money market funds	205,367		—		—		205,367		205,367		—		—
Total	$	349,462	$	—	$	—	$	349,462	$	349,462	$	—	$	—