Fair Value Measurement

12 Months Ended

Dec. 31, 2020

4. Fair Value Measurement

The following tables present information about the Company’s financial assets measured at fair value on a recurring basis and indicate the fair value hierarchy classification of such fair values as of December 31, 2020 and 2019 (in thousands):

	Fair Value Measurements at
	December 31, 2020
	Total		Level 1		Level 2		Level 3
Cash and cash equivalents:
Cash	$	395,083	$	395,083	$	—	$	—
Money market funds		742,958		742,958		—		—
Corporate debt securities		2,503		—		2,503		—
Certificates of deposit		12,527		—		12,527		—
Commercial paper		15,549		—		15,549		—
Marketable securities:
U.S. Treasury securities		47,979		—		47,979		—
Corporate debt securities		324,456		—		324,456		—
Certificates of deposit		25,162		—		25,162		—
Government-sponsored enterprise securities		33,741		—		33,741		—
Commercial paper		90,375		—		90,375		—
Other non-current assets		600		—		—		600
Total	$	1,690,933	$	1,138,041	$	552,292	$	600

	Fair Value Measurements at
	December 31, 2019
	Total		Level 1		Level 2		Level 3
Cash and cash equivalents:
Cash	$	13,998	$	13,998		—		—
Money market funds		929,773		929,773		—		—
Other non-current assets		600		—		—		600
Total	$	944,371	$	943,771	$	—	$	600

Marketable securities classified as Level 2 within the valuation hierarchy generally consist of U.S. treasury securities and government agency securities, corporate bonds, and commercial paper. The Company estimates the fair values of these marketable securities by taking into consideration valuations obtained from third-party pricing sources.

The Company holds equity securities classified as Level 3 which are not material to the Company’s financial position.

- 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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