Fair Value Measurements

3 Months Ended

Mar. 31, 2016

We use a three-tier fair value hierarchy to prioritize the inputs used in our fair value measurements. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets for identical assets, which includes our money market funds and treasury securities classified as available-for-sale securities and our investment in equity securities in publicly-held biotechnology companies; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable, which includes our fixed income securities and commercial paper classified as available-for-sale securities; and Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring us to develop our own assumptions. The majority of our securities have been classified as Level 2. We obtain the fair value of our Level 2 investments from our custodian bank or from a professional pricing service. We validate the fair value of our Level 2 investments by understanding the pricing model used by the custodian banks or professional pricing service provider and comparing that fair value to the fair value based on observable market prices. During the three months ended March 31, 2016, there were no transfers between our Level 1 and Level 2 investments. We recognize transfers between levels of the fair value hierarchy on the date of the event or change in circumstances that caused the transfer.

We measure the following major security types at fair value on a recurring basis. The following summary breaks down the fair-value hierarchy that we valued each security with at March 31, 2016 and December 31, 2015 (in thousands):

	At March 31, 2016		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)
Cash equivalents (1)	$	74,091	$	74,091	$	—
Corporate debt securities (2)		405,152		—		405,152
Debt securities issued by U.S. government agencies (2)		79,488		—		79,488
Debt securities issued by the U.S. Treasury (2)		13,101		13,101		—
Debt securities issued by states of the United States and political subdivisions of the states (3)		118,293		—		118,293
Investment in Regulus Therapeutics Inc.		19,703		19,703		—
Total	$	709,828	$	106,895	$	602,933

	At December 31, 2015		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)
Cash equivalents (1)	$	88,902	$	88,902	$	—
Corporate debt securities (2)		438,426		—		438,426
Debt securities issued by U.S. government agencies (2)		89,253		—		89,253
Debt securities issued by the U.S. Treasury (2)		2,601		2,601		—
Debt securities issued by states of the United States and political subdivisions of the states (3)		127,656		—		127,656
Investment in Regulus Therapeutics Inc.		24,792		24,792		—
Total	$	771,630	$	116,295	$	655,335

(1)

Included in cash and cash equivalents on our condensed consolidated balance sheet.

(2)

Included in short-term investments on our condensed consolidated balance sheet.

(3)

At March 31, 2016 and December 31, 2015, $5.6 million and $7.5 million, respectively, were included in cash and cash equivalents on our condensed consolidated balance sheet, with the difference included in short-term investments on our condensed consolidated balance sheet.

We did not have investments that were valued with significant unobservable inputs, or Level 3 investments, at March 31, 2016 and December 31, 2015.

Other Fair Value Disclosures

Our 1 percent and 2¾ percent notes had a fair value of $455.1 million and $124.7 million, respectively, at March 31, 2016. We determine the fair value of our notes based on quoted market prices for these notes, which are Level 2 measurements because the notes do not trade regularly.

- 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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