Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2021

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis by Level Within Fair Value Hierarchy

The following tables present the Company’s assets and liabilities that are measured at fair value on a recurring basis by level within the fair value hierarchy:

	December 31, 2021
	Level 1		Level 2		Level 3		Total
	(In thousands)
Assets:
Money market funds	$	115,410	$	—	$	—	$	115,410
US treasuries		24,053		—		—		24,053
Government treasury and agency securities		—		7,600		—		7,600
Corporate securities and commercial paper		—		171,842		—		171,842
Total assets	$	139,463	$	179,442	$	—	$	318,905

	December 31, 2020
	Level 1		Level 2		Level 3		Total
	(In thousands)
Assets:
Money market funds	$	5,508	$	—	$	—	$	5,508
Liabilities:
Convertible preferred unit warrant liability	$	—	$	—	$	314	$	314

Schedule of Fair Value and Amortized Cost of Investments in Marketable Securities

The fair value and amortized cost of investments in marketable securities by major security type are as follows:

	December 31, 2021
	Amortized Cost		Unrealized Gain		Unrealized Loss			Fair Value
	(In thousands)
Assets:
Money market funds	$	115,410	$	—	$	—		$	115,410
US treasuries		24,056	1			(4	)		24,053
Government treasury and agency securities		7,606		—		(6	)		7,600
Corporate securities and commercial paper		171,891		3		(52	)		171,842
Total financial assets	$	318,963	$	4	$	(62	)	$	318,905

	December 31, 2020
	Amortized Cost		Unrealized Gain		Unrealized Loss		Fair Value
	(In thousands)
Assets:
Money market funds	$	5,508	$	—	$	—	$	5,508

Schedule of Fair Value of Marketable Securities by Maturity Date

As of December 31, 2021, the fair value of the Company’s marketable securities, by maturity date, were as follows:

	(In thousands)
2022	$	132,436
2023		63,934
2024		—
2025		7,125
Total	$	203,495

Changes In Fair Values of Convertible Preferred Stock Warrants and Common Stock Warrants, Classified as Level 3 Financial Liabilities

The following table presents the changes in fair values of the Company’s convertible preferred stock warrants and common stock warrants, classified as level 3 financial liabilities:

	Year Ended December 31,
	2021			2020
	(In thousands)
Beginning balance	$	314		$	170
Fair value of warrants issued in connection with    debt financing		127			—
Change in fair value		1,318			144
Conversion of convertible preferred stock    warrants to common stock warrants    upon the closing of the IPO		(535	)		—
Reclassification of fair value of warrants to    equity upon the net exercise of warrants		(1,224	)		—
Ending balance	$	—		$	314