FAIR VALUE MEASUREMENTS (Tables)

9 Months Ended

Sep. 30, 2023

Fair Value Disclosures [Abstract]

Schedule of cash equivalents, restricted cash and marketable securities by security type

Cash equivalents, restricted cash and marketable securities by security type at September 30, 2023 were as follows:

			Gross		Gross
	Amortized		Unrealized		Unrealized			Estimated
(In thousands)	Cost		Gains		Losses			Fair Value
Included in cash and cash equivalents:
Money market funds	$	12,549	$	—	$	—		$	12,549
Commercial Paper		3,970		—		—			3,970
	$	16,519	$	—	$	—		$	16,519
Restricted cash:
Money market fund	$	264	$	—	$	—		$	264
Certificate of deposit		272		—		—			272
	$	536	$	—	$	—		$	536
Marketable securities:
U.S. Treasury securities - due in 1 to 2 years	$	26,467	$	1	$	(22	)	$	26,446
Government-sponsored enterprise    securities (due in less than one year)		94,524		4		(293	)		94,235
Government-sponsored enterprise    securities (due in one to two years)		10,651		—		(35	)		10,616
Commercial paper (due in less than    one year)		149,583		1		(280	)		149,304
Corporate notes (due in less than one year)		39,438		2		(160	)		39,280
Corporate notes (due in one to two years)		30,939		1		(182	)		30,758
	$	351,602	$	9	$	(972	)	$	350,639

Cash equivalents, restricted cash and marketable securities by security type at December 31, 2022 were as follows:

			Gross		Gross
	Amortized		Unrealized		Unrealized			Estimated
(In thousands)	Cost		Gains		Losses			Fair Value
Included in cash and cash equivalents:
Money market funds	$	39,771	$	—	$	—		$	39,771
	$	39,771	$	—	$	—		$	39,771
Restricted cash:
Money market fund	$	93	$	—	$	—		$	93
Certificate of deposit		271		—		—			271
	$	364	$	—	$	—		$	364
Marketable securities:
U.S. Treasury securities (due in    less than one year)	$	12,983	$	—	$	(62	)	$	12,921
Municipal securities (due in    less than one year)		3,000		—		(24	)		2,976
Government-sponsored enterprise securities    (due in less than one year)		9,860		—		(14	)		9,846
Commercial paper (due in less than    one year)		64,285		6		(92	)		64,199
Corporate notes (due in less than one year)		26,014		—		(55	)		25,959
	$	116,142	$	6	$	(247	)	$	115,901

Schedule of cash equivalents and marketable securities with unrealized losses

Cash equivalents and marketable securities with unrealized losses that have been in a continuous unrealized loss position for less than 12 months and 12 months or longer at September 30, 2023 and December 31, 2022 were as follows:

	Less Than 12 Months					12 Months or Longer					Total
			Gross					Gross					Gross
	Estimated		Unrealized			Estimated		Unrealized			Estimated		Unrealized
(In thousands)	Fair Value		Losses			Fair Value		Losses			Fair Value		Losses
As of September 30, 2023:
US Treasury Securities (due in less than one year)	$	26,446	$	(22	)	$	—	$	—		$	26,446	$	(22	)
Government-sponsored enterprise    securities (due in less than one year)		94,523		(293	)		—		—			94,523		(293	)
Government-sponsored enterprise    securities (due in one to two years)		10,651		(35	)		—		—			10,651		(35	)
Commercial paper (due in less than    one year)		149,584		(281	)		—		—			149,584		(281	)
Corporate notes (due in less than    one year)		39,438		(160	)		—		—			39,438		(160	)
Corporate notes (due in one to    two years)		30,939		(181	)		—		—			30,939		(181	)
	$	351,581	$	(972	)	$	—	$	—		$	351,581	$	(972	)
As of December 31, 2022:
U.S. Treasury securities (due in less than one year)	$	11,424	$	(57	)	$	1,497	$	(5	)	$	12,921	$	(62	)
Municipal securities    (due in less than a year)		—		—			2,976		(24	)		2,976		(24	)
Government-sponsored    enterprise securities    (due in less than one year)		9,845		(14	)		—		—			9,845		(14	)
Commercial paper (due in less than    one year)		52,454		(92	)		—		—			52,454		(92	)
Corporate notes (due in    less than one year)		1,998		(2	)		23,962		(53	)		25,960		(55	)
	$	75,721	$	(165	)	$	28,435	$	(82	)	$	104,156	$	(247	)

Schedule of financial instruments measured at fair value on recurring basis

The following table presents information about our financial instruments that are measured at fair value on a recurring basis as of September 30, 2023 and December 31, 2022 and indicates the fair value category assigned.

	Fair Value Measurements at Reporting Date Using
	Quoted Prices in				Significant
	Active Markets for		Significant Other		Unobservable
	Identical Assets		Observable Inputs		Inputs
(In thousands)	Level 1		Level 2		Level 3		Total
As of September 30, 2023:
Money market funds(1)(2)	$	12,813	$	—	$	—	$	12,813
Certificate of deposit(2)		272		—		—		272
U.S. Treasury securities(3)		—		26,446		—		26,446
Government-sponsored enterprise    securities(3)(4)		—		104,852		—		104,852
Commercial paper(3)		—		153,274		—		153,274
Corporate notes(3)(4)		—		70,037		—		70,037
Total	$	13,085	$	354,609	$	—	$	367,694
As of December 31, 2022:
Money market funds(1)(2)	$	39,864	$	—	$	—	$	39,864
Certificate of deposit(2)		271		—		—		271
U.S. Treasury securities(3)		—		12,921		—		12,921
Municipal securities(3)		—		2,976		—		2,976
Government-sponsored enterprise    securities(2)		—		9,846		—		9,846
Commercial paper(3)		—		64,199		—		64,199
Corporate notes(3)		—		25,959		—		25,959
Total	$	40,135	$	115,901	$	—	$	156,036

(1)Included in cash and cash equivalents on our condensed consolidated balance sheets.

(2)Included in restricted cash on our condensed consolidated balance sheets.

(3)Included in current portion of marketable securities on our condensed consolidated balance sheets.

(4)Included in noncurrent portion of marketable securities on our condensed consolidated balance sheets.