Fair Value Measurements

3 Months Ended

Mar. 31, 2016

Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]

The following table presents our fair value hierarchy for our assets measured at fair value on a recurring basis at March 31, 2016 (in thousands):



	Level 1		Level 2		Total
Cash equivalents:
Money market funds	$	88,990	$	—	$	88,990
Short-term investments:
Commercial paper	—		38,434		38,434
Corporate notes and bonds	—		350,828		350,828
Certificates of deposit	—		6,962		6,962
U.S. government agency securities	—		51,199		51,199
Long-term investments:
Corporate notes and bonds	—		304,938		304,938
Certificates of deposit	—		7,505		7,505
U.S. government agency securities	—		49,388		49,388
Total	$	88,990	$	809,254	$	898,244

The following table presents our fair value hierarchy for our assets measured at fair value on a recurring basis at December 31, 2015 (in thousands):



	Level 1		Level 2		Total
Cash equivalents:
Money market funds	$	263,515	$	—	$	263,515
Commercial paper	—		2,000		2,000
Corporate notes and bonds	—		1,119		1,119
Short-term investments:
Commercial paper	—		32,394		32,394
Corporate notes and bonds	—		303,567		303,567
Certificates of deposit	—		23,736		23,736
U.S. government agency securities	—		29,248		29,248
Long-term investments:
Corporate notes and bonds	—		311,467		311,467
Certificates of deposit	—		5,859		5,859
U.S. government agency securities	—		105,341		105,341
Total	$	263,515	$	814,731	$	1,078,246

We determine the fair value of our security holdings based on pricing from our service provider and market prices from industry-standard independent data providers. Such market prices may be quoted prices in active markets for identical assets (Level 1 inputs) or pricing determined using inputs other than quoted prices that are observable either directly or indirectly (Level 2 inputs), such as yield curve, volatility factors, credit spreads, default rates, loss severity, current market and contractual prices for the underlying instruments or debt, broker and dealer quotes, as well as other relevant economic measures.

See Note 8 for the fair value measurement of our convertible senior notes.

- 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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