Investments (Tables)

12 Months Ended

Dec. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Schedule of amortized cost and gross unrealized losses on all securities

			Gross		Gross
	Amortized		unrealized		unrealized		Fair
	cost		gains		losses		value
	(in thousands)
Short-term investments:
U.S. Treasury securities	$	14,751	$	-	$	-	$	14,751
Total short-term investments	$	14,751	$	-	$	-	$	14,751

			Gross		Gross
	Amortized		unrealized		unrealized		Fair
	cost		gains		losses		value
	(in thousands)
Short-term investments:
U.S. Treasury securities	$	14,748	$	-	$	-	$	14,748
Total short-term investments	$	14,748	$	-	$	-	$	14,748

Schedule of financial assets measured at fair value on a recurring basis

	Level 1		Level 2		Level 3		Total
	(in thousands)
Cash equivalents:
Money market funds	$	3,137	$	-	$	-	$	3,137
Investments:
Available-for-sales securities—current:
U.S. Treasury securities		-		14,751		-		14,751
Total	$	3,137	$	14,751	$	-	$	17,888

	Level 1		Level 2		Level 3		Total
	(in thousands)
Cash equivalents:
Money market funds	$	3,136	$	-	$	-	$	3,136
Investments:
Available-for-sales securities—current:
U.S. Treasury securities		-		14,748		-		14,748
Total	$	3,136	$	14,748	$	-	$	17,884