Investments (Tables)

9 Months Ended

Sep. 30, 2021

Investments, Debt and Equity Securities [Abstract]

Schedule of fair value of securities, not including cash

The following tables summarize the gross unrealized gains and losses of the Company’s marketable securities as of September 30, 2021 and December 31, 2020:

	September 30, 2021
			Gross Unrealized						Estimated Fair Value
(In thousands)	Amortized Cost		Gains		Losses		Credit Losses
Commercial paper	$	13,243	$	—	$	(1)	$	—	$	13,242
Corporate notes	48,178		—		(22)		—		48,156
U.S. government securities	1,500		—		—		—		1,500
U.S. government agency bonds	1,075		—		—		—		1,075
	$	63,996	$	—	$	(23)	$	—	$	63,973
Classified as:
Short-term investments									$	43,738
Long-term investments									20,235
									$	63,973

	December 31, 2020
			Gross Unrealized						Estimated Fair Value
(In thousands)	Amortized Cost		Gains		Losses		Credit Losses
Commercial paper	$	8,993	$	1	$	—	$	—	$	8,994
Corporate notes	35,917		—		—		(6)		35,911
U.S. government securities	12,828		14		—		—		12,842
U.S. government agency bonds	5,000		1		—		—		5,001
U.S. asset-backed securities	3,534		4		—		—		3,538
	$	66,272	$	20	$	—	$	(6)	$	66,286
Classified as:
Short-term investments									$	42,187
Long-term investments									24,099
									$	66,286