Note 3 - Cash and Investments

9 Months Ended

Sep. 30, 2022

Notes to Financial Statements

Cash, Cash Equivalents, and Short-Term Investments [Text Block]

3. Cash and Investments

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

	September 30, 2022		December 31, 2021
Cash	$	2,063	$	2,506
Cash equivalents (see detail in Note 4)		24,102		37,023
Restricted cash (see detail in Note 4)		221		557
Total cash, cash equivalents and restricted cash		26,386		40,086
Short-term investments		10,677		—
Total cash, cash equivalents, restricted cash and short-term investments	$	37,063	$	40,086

The following table sets forth information regarding the amortized cost basis and fair value of our short-term investments that are classified as held-to-maturity ("HTM") (in thousands):

							Gross		Gross
	Amortized		Allowance for		Net carrying		unrealized		unrealized		Fair
	cost		credit losses		amount		gains		losses		value
U.S. treasury securities	$	10,677	$	—	$	10,677	$	—	$	3	$	10,674
Total	$	10,677	$	—	$	10,677	$	—	$	3	$	10,674