Fair Value Measurement (Tables)

12 Months Ended

Dec. 31, 2021

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value On A Recurring Basis

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

Assets and liabilities measured at fair value on a recurring basis consist of the following as of December 31, 2020 (in thousands):

			Fair Value Measurements at Reporting Date Using
	December 31, 2020		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	$	2,841	$	2,841	$	—	$	—
Marketable securities:
Tax-exempt municipal securities	20,289		—		20,289		—
Corporate debt securities	17,538		—		17,538		—
Total assets at fair value on a recurring basis	$	40,668	$	2,841	$	37,827	$	—
Liabilities:
Deferred payments	$	1,658	$	—	$	—	$	1,658

Schedule of Changes in Fair Value of Level 3 Liability

Changes in the fair value of the Company’s Level 3 liabilities during the years ended December 31, 2020 and 2021 are as follows (in thousands):

	December 31, 2020		December 31, 2021
Balance as of the beginning of period	$	3,257	$	1,658
Amounts paid	(1,628)		(1,470)
Other adjustments to fair value	29		470
Balance at end of period	$	1,658	$	658