Note 4 - Cash, Cash Equivalents, Investments and Restricted Cash

12 Months Ended

Dec. 31, 2024

Notes to Financial Statements

Financial Instruments Disclosure [Text Block]

4.  CASH, CASH EQUIVALENTS, INVESTMENTS AND RESTRICTED CASH

The following is a summary of the Company’s cash, cash equivalents and debt investments (in thousands): 

	December 31,
	2024		2023
Cash	$	679,949	$	392,329
Money market funds		11,867		135,514
Certificates of deposit		164,418		127,123
Corporate debt securities		6,712		95,101
U.S. treasuries and government agency bonds		-		358,409
Auction-rate securities backed by student-loan notes		148		567
Total	$	863,094	$	1,109,043

	December 31,
	2024		2023
Reported as:
Cash and cash equivalents	$	691,816	$	527,843
Short-term investments		171,130		580,633
Investment within other long-term assets		148		567
Total	$	863,094	$	1,109,043

The following table summarizes the contractual maturities of the short-term and long-term available-for-sale investments as of December 31, 2024 (in thousands): 

	Amortized Cost		Fair Value
Due in less than 1 year	$	171,197	$	171,130
Due in 1 - 5 years		-		-
Due in greater than 5 years		150		148
Total	$	171,347	$	171,278

Gross realized gains and losses were not material for the periods presented.

The following tables summarize the unrealized gain and loss positions related to the available-for sale investments (in thousands): 

	December 31, 2024
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
Money market funds	$	11,867	$	-	$	-		$	11,867
Certificates of deposit		164,418		-		-			164,418
Corporate debt securities		6,779		-		(67	)		6,712
Auction-rate securities backed by student-loan notes		150		-		(2	)		148
Total	$	183,214	$	-	$	(69	)	$	183,145

	December 31, 2023
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
Money market funds	$	135,514	$	-	$	-		$	135,514
Certificates of deposit		127,123		-		-			127,123
Corporate debt securities		96,636		4		(1,539	)		95,101
U.S. treasuries and government agency bonds		358,177		327		(95	)		358,409
Auction-rate securities backed by student-loan notes		574		-		(7	)		567
Total	$	718,024	$	331	$	(1,641	)	$	716,714

The following tables present information about the available-for-sale investments that had been in a continuous unrealized loss position for less than 12 months and for greater than 12 months (in thousands):

	December 31, 2024
	Less than 12 Months				Greater than 12 Months					Total
	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Corporate debt securities	$	-	$	-	$	6,712	$	(67	)	$	6,712	$	(67	)
U.S. treasuries and government agency bonds		-		-		-		-			-		-
Auction-rate securities backed by student-loan notes		-		-		148		(2	)		148		(2	)
Total	$	-	$	-	$	6,860	$	(69	)	$	6,860	$	(69	)

	December 31, 2023
	Less than 12 Months					Greater than 12 Months					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Corporate debt securities	$	20,792	$	(19	)	$	70,806	$	(1,520	)	$	91,598	$	(1,539	)
U.S. treasuries and government agency bonds		97,599		(95	)		-		-			97,599		(95	)
Auction-rate securities backed by student-loan notes		-		-			567		(7	)		567		(7	)
Total	$	118,391	$	(114	)	$	71,373	$	(1,527	)	$	189,764	$	(1,641	)

An impairment exists when the fair value of an investment is less than its amortized cost basis. As of December 31, 2024 and 2023, the Company did not consider the impairment of its investments to be a result of credit losses. The Company typically invests in highly rated securities, with the primary objective of minimizing the potential risk of principal loss. The Company’s investment policy generally requires securities to be investment grade and limits the amount of credit exposure to any one issuer. When evaluating a debt security for impairment, management reviews factors such as the Company’s intent to sell, or whether it will more likely than not be required to sell, the security before recovery of its amortized cost basis, the extent to which the fair value of the security is less than its cost, the financial condition of the issuer and the credit quality of the investment.

Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported on the Consolidated Balance Sheets to the amounts reported on the Consolidated Statements of Cash Flows (in thousands):   

	December 31,
	2024		2023
Cash and cash equivalents	$	691,816	$	527,843
Restricted cash included in other current assets		-		33,204
Restricted cash included in other long-term assets		125		134
Total cash, cash equivalents and restricted cash reported on the Consolidated Statements of Cash Flows	$	691,941	$	561,181

As of December 31, 2023, restricted cash included in other current assets was related to preliminary purchase consideration held in a trust account in connection with the Company’s acquisition of Axign.