Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2025

Schedule of Cash, Cash Equivalents and Debt Investments by Significant Category

The following tables show our cash, cash equivalents, and debt investments by significant investment category:


	June 30, 2025
	Adjusted cost		Unrealized Gains		Unrealized Losses		Fair Value		Cash and Cash Equivalents		Current Investments		Long-term Investments
Cash	$	100,423	$	-	$	-	$	100,423	$	100,423	$	-	$	-
Level 1
Money market funds	665,643		-		-		665,643		665,643		-		-
Time deposits	78,458		-		-		78,458		78,458		-		-
U.S. Treasury securities	1,091,959		4,270		4		1,096,225		-		656,554		435,405
Corporate debt securities	38,368		74		-		38,442		-		38,368		-
Subtotal	1,874,428		4,344		4		1,878,768		744,101		694,922		435,405
Level 3
Corporate debt security(1)	15,601		-		3		15,598		-		2,800		12,801
Notes receivable(2)	3,852		394		-		4,246		-		4,246		-
Subtotal	19,453		394		3		19,844		-		7,046		12,801
Total	$	1,994,304	$	4,738	$	7	$	1,999,035	$	844,524	$	701,968	$	448,206


	December 31, 2024
	Adjusted cost		Unrealized Gains		Unrealized Losses		Fair Value		Cash and Cash Equivalents		Current Investments		Long-term Investments
Cash	$	95,969	$	-	$	-	$	95,969	$	95,969	$	-	$	-
Level 1
Money market funds	574,689		-		-		574,689		574,689		-		-
Time deposits	77,879		-		-		77,879		77,879		-		-
U.S. Treasury securities	1,404,777		4,831		693		1,408,915		-		635,392		769,385
Corporate debt securities	48,210		116		-		48,326		-		34,736		13,474
Subtotal	2,105,555		4,947		693		2,109,809		652,568		670,128		782,859
Level 3
Corporate debt security(1)	16,401		11		-		16,412		-		2,000		14,401
Notes receivable(2)	3,763		250		-		4,013		-		2,250		1,763
Subtotal	20,164		261		-		20,425		-		4,250		16,164
Total	$	2,221,688	$	5,208	$	693	$	2,226,203	$	748,537	$	674,378	$	799,023

(1)The fair value of the corporate debt security is measured using Level 3 (unobservable) inputs. We determined the fair value for the corporate debt security using an internally-developed valuation model and unobservable inputs include credit and liquidity spreads and effective maturity.

(2)We have elected to measure our investment in convertible notes receivable of private companies at fair value under the fair value option. The fair value of the notes receivable are measured using Level 3 (unobservable) inputs. We determined the fair value for the notes receivable using an internally-developed valuation model and unobservable inputs include estimates of the equity value of the underlying business and the timing and probability of future financing events.