Available-for-Sale Securities (Tables)

12 Months Ended

Dec. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-Sale Debt Securities

Available-for-sale debt securities with maturities of more than three months from the date of purchase as of December 31, 2020 have been classified as short-term investments, and were as follows (in thousands):

	Amortized Cost		Unrealized Gains		Unrealized Losses			Market Value
December 31, 2020:
U.S. Treasury securities	$	55,085	$	2	$	(1	)	$	55,086
Certificates of deposit		490		—		—			490
	$	55,575	$	2	$	(1	)	$	55,576