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Cash and Investments in Marketable Securities

9 Months Ended

Sep. 30, 2020

Cash and Investments in Marketable Securities

Cash and investments in marketable securities, including cash equivalents, are as follows (in thousands):


	Estimated Fair Value at
	September 30, 2020		December 31, 2019
Cash and cash equivalents	$	55,843	$	96,363
Short-term investments	900,163		1,228,499
Long-term investments	197,715		279,119
Total cash and investments in marketable securities	$	1,153,721	$	1,603,981

We invest in liquid, high quality debt securities. Our investments in debt securities are subject to interest rate risk. To minimize the exposure due to an adverse shift in interest rates, we invest in securities with maturities of two years or less and maintain a weighted average maturity of one year or less. As of September 30, 2020 and December 31, 2019, all of our long-term investments had maturities between one and two years.

During the three months ended September 30, 2020, we sold no available-for-sale securities. During the nine months ended September 30, 2020, we sold available-for-sale securities totaling $41.7 million. Gross realized gains and losses on those sales were not significant. During the three and nine months ended September 30, 2019, we did not sell any of our available-for-sale securities. The cost of securities sold is based on the specific identification method.

We report our accrued interest receivable, which totaled $5.4 million and $6.5 million at September 30, 2020 and December 31, 2019, respectively, in other current assets on our Condensed Consolidated Balance Sheets.

Our portfolio of cash and investments in marketable securities includes (in thousands):


		September 30, 2020								December 31, 2019
	Fair Value Hierarchy Level	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value		Fair Value
Corporate notes and bonds	2	$	831,575	$	2,341	$	(201)	$	833,715	$	1,132,182
Corporate commercial paper	2	245,796		131		(14)		245,913		375,473
Obligations of U.S. government agencies	2	9,998		1		—		9,999		—
Available-for-sale investments		$	1,087,369	$	2,473	$	(215)	$	1,089,627	$	1,507,655
Money market funds	1							48,931		83,546
Certificates of deposit	N/A							8,795		6,951
Cash	N/A							6,368		5,829
Total cash and investments in marketable securities								$	1,153,721	$	1,603,981

Level 1 — Quoted prices in active markets for identical assets or liabilities.

Level 2 — Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices for identical or similar assets or liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

We use a market approach to value our Level 2 investments. The disclosed fair value related to our investments is based on market prices from a variety of industry standard data providers and generally represents quoted prices for similar assets in active markets or has been derived from observable market data.

Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

At December 31, 2019, our gross unrealized gains and losses totaled $2.1 million and $0.3 million, respectively.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

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