Fair Value Measurement (Tables)

3 Months Ended

Mar. 31, 2022

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value

Assets measured at fair value on a recurring basis consist of the following as of March 31, 2022 (in thousands):

			Fair Value Measurements at Reporting Date Using
	March 31, 2022		Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Money market funds	$	5,346	$	5,346	$	—	$	—
Marketable securities:
Tax-exempt municipal securities	18,371		—		18,371		—
Corporate debt securities	9,691		—		9,691		—
Total assets at fair value on a recurring basis	$	33,408	$	5,346	$	28,062	$	—

Assets and liabilities measured at fair value on a recurring basis consist of the following as of December 31, 2021 (in thousands):

			Fair Value Measurements at Reporting Date Using
	December 31, 2021		Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Money market funds	$	4,134	$	4,134	$	—	$	—
Marketable securities:
Tax-exempt municipal securities	18,817		—		18,817		—
Corporate debt securities	11,061		—		11,061		—
Total assets at fair value on a recurring basis	$	34,012	$	4,134	$	29,878	$	—
Liabilities:
Deferred payments	$	658	$	—	$	—	$	658

Schedule of Changes in Fair Value of Level 3 Liability

Changes in the fair value of the Company’s Level 3 liabilities during the three months ended March 31, 2021 and 2022 are as follows (in thousands):

	As of March 31,
	2021		2022
Balance as of the beginning of period	$	1,658	$	658
Amounts paid	(730)		(658)
Other adjustments to fair value	418		—
Balance at end of period	$	1,346	$	—