Investments

12 Months Ended

Dec. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Investments

3. Investments

The amortized cost and estimated fair value of investments, by contractual maturity are as follows:

	December 31, 2021
(in thousands)	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Fair Value
Maturing in one year or less
Corporate debt	$	7,603	$	—	$	—	$	7,603
U.S. Treasuries		30,119		—		—		30,119
Maturing after one year through five years
Corporate debt		5,006		—		—		5,006
U.S. Treasuries		44,940		—		—		44,940
Total	$	87,668	$	—	$	—	$	87,668

The Company held no investments at December 31, 2020.