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Fair Value Measurements | 9 Months Ended
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Sep. 28, 2018
Fair Value Disclosures [Abstract] |
FAIR VALUE MEASUREMENTS | FAIR VALUE MEASUREMENTS 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):
| September 30, 2018
| Level 1 |  | Level 2 |  | Total
Money market funds | $ | 62,325 |  |  | $ | — |  |  | $ | 62,325 |
Certificates of deposit | — |  |  | 19,098 |  |  | 19,098 |
Commercial paper | — |  |  | 355,720 |  |  | 355,720 |
Corporate bonds | — |  |  | 261,594 |  |  | 261,594 |
U.S. Treasury and government sponsored enterprises | — |  |  | 50,564 |  |  | 50,564 |
Total financial assets | $ | 62,325 |  |  | $ | 686,976 |  |  | $ | 749,301 |
| 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 September 30, 2018 or December 31, 2017 and there were no transfers of financial assets or liabilities classified as Level 3 during the nine months ended September 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.

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- 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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