FAIR VALUE MEASUREMENTS (Tables)

9 Months Ended

Sep. 30, 2022

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, 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	$	17,362	$	—	$	—		$	17,362
Commercial paper		34,159		—		(7	)		34,152
	$	51,521	$	—	$	(7	)	$	51,514
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)	$	24,493	$	—	$	(174	)	$	24,319
Municipal securities (due in less than    one year)		3,000		—		(50	)		2,950
Government-sponsored enterprise    securities (due in less than one year)		13,325		3		(29	)		13,299
Commercial paper (due in less than    one year)		67,432		—		(215	)		67,217
Corporate notes (due in less than    one year)		26,068		—		(169	)		25,899
	$	134,318	$	3	$	(637	)	$	133,684

Cash equivalents, restricted cash and marketable securities by security type at December 31, 2021 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	$	24,207	$	—	$	—		$	24,207
Commercial paper		7,499		—		—			7,499
	$	31,706	$	—	$	—		$	31,706
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)	$	15,585	$	—	$	(18	)	$	15,567
U.S. Treasury securities (due in one to    two years)		1,524		—		(3	)		1,521
Municipal securities (due in one to    two years)		3,000		—		(15	)		2,985
Government-sponsored enterprise    securities (due in less than one year)		12,500		—		(7	)		12,493
Commercial paper (due in less than    one year)		84,398		2		(38	)		84,362
Corporate notes (due in less than one year)		36,444		2		(17	)		36,429
Corporate notes (due in one to two years)		24,224		—		(79	)		24,145
	$	177,675	$	4	$	(177	)	$	177,502

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, 2022 and December 31, 2021 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, 2022:
U.S. Treasury securities (due in    less than one year)	$	17,333	$	(147	)	$	6,986	$	(27	)	$	24,319	$	(174	)
Municipal securities (due in less    than one year)		2,950		(50	)		—		—			2,950		(50	)
Government-sponsored enterprise    securities (due in less than    one year)		2,956		—			4,971		(29	)		7,927		(29	)
Commercial paper (due in less    than one year)		99,936		(222	)		—		—			99,936		(222	)
Corporate notes (due in less than    one year)		5,991		(15	)		19,908		(154	)		25,899		(169	)
	$	129,166	$	(434	)	$	31,865	$	(210	)	$	161,031	$	(644	)
As of December 31, 2021:
U.S. Treasury securities (due in    less than one year)	$	15,567	$	(18	)	$	—	$	—		$	15,567	$	(18	)
U.S. Treasury securities (due in    one to two years)		1,521		(3	)		—		—			1,521		(3	)
Municipal securities (due in one    to two years)		2,985		(15	)		—		—			2,985		(15	)
Government-sponsored enterprise    securities (due in less than    one year)		1,500		—			4,993		(7	)		6,493		(7	)
Commercial paper (due in less    than one year)		66,872		(38	)		—		—			66,872		(38	)
Corporate notes (due in less than    one year)		16,001		(17	)		—		—			16,001		(17	)
Corporate notes (due in one to    two years)		24,145		(79	)		—		—			24,145		(79	)
	$	128,591	$	(170	)	$	4,993	$	(7	)	$	133,584	$	(177	)

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, 2022 and December 31, 2021 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, 2022:
Money market funds(1)	$	17,362	$	—	$	—	$	17,362
U.S. Treasury securities(2)		—		24,319		—		24,319
Municipal securities(2)		—		2,950		—		2,950
Government-sponsored enterprise    securities(2)		—		13,299		—		13,299
Commercial paper(1)(2)		—		101,369		—		101,369
Corporate notes(2)		—		25,899		—		25,899
Total	$	17,362	$	167,836	$	—	$	185,198
As of December 31, 2021:
Money market funds(1)	$	24,207	$	—	$	—	$	24,207
U.S. Treasury securities(2)(3)		—		17,088		—		17,088
Municipal securities(3)		—		2,985		—		2,985
Government-sponsored enterprise    securities(2)		—		12,493		—		12,493
Commercial paper(1)(2)		—		91,861		—		91,861
Corporate notes(2)(3)		—		60,574		—		60,574
Total	$	24,207	$	185,001	$	—	$	209,208

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

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

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