Short-Term Investments

6 Months Ended

Jun. 30, 2022

Investments, Debt and Equity Securities [Abstract]

Short-Term Investments

3. SHORT-TERM INVESTMENTS

Short-term investments, which are classified as available-for-sale, consisted of the following:

Balance at June 30, 2022:	Amortized Cost Basis		Unrealized Loss			Fair Value
	(in thousands)
Treasury notes	$	6,011	$	(11	)	$	6,000
Treasury bills		47,953		(36	)		47,917
Commercial paper		62,835		(1	)		62,834
Corporate debt securities		22,643		(153	)		22,490
Total short-term investments	$	139,442	$	(201	)	$	139,241

Balance at December 31, 2021:	Amortized Cost Basis		Unrealized Loss			Fair Value
	(in thousands)
Commercial paper	$	33,979	$	(1	)	$	33,978
Corporate debt securities		11,953		(4	)		11,949
Total short-term investments	$	45,932	$	(5	)	$	45,927

As of June 30, 2022 and December 31, 2021, all investments had contractual maturities within one year.