Short-Term Investments (Tables)

9 Months Ended

Sep. 30, 2022

Investments, Debt and Equity Securities [Abstract]

Summary of short-term investments

Short-term investments as of December 31, 2021 consisted of the following (in thousands):

			Gross
	Amortized		Unrealized		Estimated
	Cost		Gain (Loss)		Fair Value
Municipal bonds and notes	$	6,001	$	(1)	$	6,000
Zero coupon bonds		123,210		(18)		123,192
Certificates of deposit		530		—		530
Total short-term investments	$	129,741	$	(19)	$	129,722

Short-term investments as of September 30, 2022 consisted of the following (in thousands):

			Gross
	Amortized		Unrealized		Estimated
	Cost		Gain (Loss)		Fair Value
Zero coupon bonds	$	111,154	$	(695)	$	110,459
Certificates of deposit		530		—		530
Total short-term investments	$	111,684	$	(695)	$	110,989