Investments (Tables)

6 Months Ended

Jun. 30, 2021

Investments, Debt and Equity Securities [Abstract]

Schedule of amortized cost and gross unrealized losses on all securities

	Amortized cost		Gross unrealized gains		Gross unrealized losses		Fair value
	(in thousands)
Short-term investments:
U.S. Treasury securities	$	14,749	$	—	$	—	$	14,749

	Amortized cost		Gross unrealized gains		Gross unrealized losses		Fair value
	(in thousands)
Short-term investments:
U.S. Treasury securities	$	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-sale securities — current:
U.S. Treasury securities		—		14,749		—		14,749
Total	$	3,137	$	14,749	$	—	$	17,886

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