CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS (Tables)

12 Months Ended

Dec. 31, 2020

CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS

Schedule of cash, cash equivalents and short-term investments

Cash, cash equivalents and short-term investments consist of the following (in thousands):

	December 31,
	2020		2019
Cash	$	1,988	$	3,371
Money market funds		19,487		7,457
U.S. treasury bills		10,034		12,539
Government-sponsored enterprise securities		4,920		19,017
Corporate bonds and commercial paper		20,898		55,694
	$	57,327	$	98,078
Reported as:
Cash and cash equivalents	$	30,373	$	22,521
Short-term investments		26,954		75,557
	$	57,327	$	98,078

Schedule of cash equivalents and short-term investments including securities with unrealized gains and losses

Cash equivalents and short-term investments included the following securities with gross unrealized gains and losses (in thousands):

			Gross		Gross
	Amortized		Unrealized		Unrealized
December 31, 2020	Cost		Gains		Losses		Fair Value
U.S. treasury bills	$	10,036	$	—	$	(2)	$	10,034
Government-sponsored enterprise securities		4,920		—		—		4,920
Corporate bonds and commercial paper		20,900		—		(2)		20,898
Total	$	35,856	$	—	$	(4)	$	35,852

			Gross		Gross
	Amortized		Unrealized		Unrealized
December 31, 2019	Cost		Gains		Losses		Fair Value
U.S. treasury bills	$	12,532	$	8	$	(1)	$	12,539
Government-sponsored enterprise securities		19,010		8		(1)		19,017
Corporate bonds and commercial paper		55,685		14		(5)		55,694
Total	$	87,227	$	30	$	(7)	$	87,250

Schedule of fair value and gross unrealized losses of investments in unrealized loss position

The following table shows the fair value and gross unrealized losses of our investments in individual securities that are in an unrealized loss position, aggregated by investment category (in thousands):

December 31, 2020	Fair Value		Unrealized Losses
U. S. treasury bills	$	9,034	$	(2)
Corporate bonds and commercial paper		14,652		(2)
Total	$	23,686	$	(4)