Fair Value Measurements

3 Months Ended

Mar. 29, 2019

The classification within the fair value hierarchy of our financial assets that were measured and recorded at fair value on a recurring basis was as follows (in thousands):



	March 31, 2019
	Level 1		Level 2		Total
Money market funds	$	75,171	$	—	$	75,171
Commercial paper	—		414,317		414,317
Corporate bonds	—		418,385		418,385
U.S. Treasury and government sponsored enterprises	—		84,487		84,487
Total investments available-for-sale	75,171		917,189		992,360
Certificates of deposit	—		25,990		25,990
Total financial assets carried at fair value	$	75,171	$	943,179	$	1,018,350



	December 31, 2018
	Level 1		Level 2		Total
Money market funds	$	47,744	$	—	$	47,744
Commercial paper	—		381,133		381,133
Corporate bonds	—		344,064		344,064
U.S. Treasury and government sponsored enterprises	—		55,201		55,201
Total investments available-for-sale	47,744		780,398		828,142
Certificates of deposit	—		16,596		16,596
Total financial assets carried at fair value	$	47,744	$	796,994	$	844,738

We did not have any financial liabilities measured and recorded at fair value on a recurring basis as of March 31, 2019 or December 31, 2018. We did not have any financial assets or liabilities classified as Level 3 in the fair value hierarchy as of March 31, 2019 or December 31, 2018. There were no transfers of financial assets or liabilities between Levels 1, 2 and 3 during the three months ended March 31, 2019 or 2018.

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.

See “Note 11. Commitments” to our Consolidated Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2018 for a description of the determination of the amount of our operating lease liabilities. Our remaining financial assets and liabilities include cash and restricted cash, Trade receivables, net, Other receivables, 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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