Fair Value Measurements

3 Months Ended

Mar. 31, 2021

The following table represents the Company's fair value hierarchy for its financial assets and liabilities (in thousands):


	Fair Value at March 31, 2021						Fair Value at December 31, 2020
Assets	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
Money market funds(1)	$	233,344	$	—	$	—	$	96,116	$	—	$	—
Government-backed securities(1)	—		54,250		—		—		44,250		—
Treasury securities(2)	—		25,022		—		—		54,088		—
Corporate debt securities(3)	—		1,549,387		—		—		373,681		—
Agency securities	—		—		—		—		20,600		—
Total cash equivalents and marketable securities	$	233,344	$	1,628,659	$	—	$	96,116	$	492,619	$	—
Liabilities
Convertible notes payable	$	—	$	533,705	$	—	$	—	$	407,238	$	—

(1)Classified as cash and cash equivalents as of March 31, 2021 and December 31, 2020, respectively, on the consolidated balance sheets.

(2)Includes $25,022 and $44,052 classified as cash and cash equivalents as of March 31, 2021 and December 31, 2020, respectively, on the consolidated balance sheets.

(3)Includes $1,547,137 and $246,668 classified as cash and cash equivalents as of March 31, 2021 and December 31, 2020, respectively, on the consolidated balance sheets.

Fixed-income investments categorized as Level 2 are valued at the custodian bank by a third-party pricing vendor's valuation models that use verifiable observable market data, e.g., interest rates and yield curves observable at commonly quoted intervals and credit spreads, bids provided by brokers or dealers or quoted prices of securities with similar characteristics. Pricing of the Company's Notes (see Note 8) has been estimated using other observable inputs, including the price of the Company's common stock, implied volatility, interest rates and credit spreads among others.

During the three months ended March 31, 2021 and 2020, the Company did not have any transfers between levels.

- 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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