Fair Value Measurements

6 Months Ended

Jun. 29, 2018

The classification of our financial assets within the fair value hierarchy that were measured and recorded at fair value on a recurring basis was as follows; the amounts presented exclude cash, but include investments classified as cash equivalents (in thousands):



	June 30, 2018
	Level 1		Level 2		Total
Money market funds	$	54,546	$	—	$	54,546
Certificates of deposit	—		21,095		21,095
Commercial paper	—		280,654		280,654
Corporate bonds	—		218,104		218,104
U.S. Treasury and government sponsored enterprises	—		20,477		20,477
Total financial assets	$	54,546	$	540,330	$	594,876



	December 31, 2017
	Level 1		Level 2		Total
Money market funds	$	45,478	$	—	$	45,478
Commercial paper	—		199,647		199,647
Corporate bonds	—		179,022		179,022
U.S. Treasury and government sponsored enterprises	—		16,263		16,263
Total financial assets	$	45,478	$	394,932	$	440,410

We did not have any financial liabilities measured and recorded at fair value on a recurring basis as of those dates. We did not have any financial assets or liabilities classified as Level 3 in the fair value hierarchy as of June 30, 2018 or December 31, 2017 and there were no transfers of financial assets or liabilities classified as Level 3 during the six months ended June 30, 2018 or 2017.

When available, we value investments based on quoted prices for those financial instruments, which is a Level 1 input. Our remaining investments are valued using third-party pricing sources, which use observable market prices, interest rates and yield curves observable at commonly quoted intervals for similar assets as observable inputs for pricing, which is a Level 2 input.

Our remaining financial assets and liabilities include Cash, Trade and other receivables, Unbilled collaboration revenue, Accounts payable, Accrued compensation and benefits, Accrued clinical trial liabilities, Accrued collaboration liabilities, Rebates and fees due to customers, and other current and long-term liabilities. Those financial assets and liabilities are carried at cost which approximates their fair values.

- 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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