Investments (Tables)

12 Months Ended

Dec. 31, 2020

Investments, Debt and Equity Securities [Abstract]

Summary 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	$	14,748	$	—	$	—	$	14,748
Marketable securities		—		—		—		—
Total short-term investments	$	14,748	$	—	$	—	$	14,748

	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
	(in thousands)
Short-term investments:
U.S. Treasury securities	$	14,668	$	—	$	—		$	14,668
Marketable securities		961				(171	)		790
Total short-term investments	$	15,629	$	—	$	(171	)	$	15,458

Summary 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	$	3,136	$	—	$	—	$	3,136
Investments:
Available-for-sales securities—current:
U.S. Treasury securities		—		14,748		—		14,748
Total	$	3,136	$	14,748	$	—	$	17,884

	Level 1		Level 2		Level 3		Total
	(in thousands)
Cash equivalents:
Money market funds	$	3,759	$	—	$	—	$	3,759
Investments:
Available-for-sales securities—current:
U.S. Treasury securities		—		14,668		—		14,668
		790						790
Total	$	4,549	$	14,668	$	—	$	19,217